Tense, aspect, conditionals and voice

Show when an action happens and how it unfolds

Verbs communicate time, but they also show whether an action is ongoing, completed, repeated or connected to another moment. Tense and aspect work together. The present simple commonly describes habits, facts and regular states: “Water boils when it reaches its boiling point under the stated conditions.” A habitual action may occur often without happening at the exact moment of speaking. The present continuous uses am/is/are + -ing: “The class is writing a test now.” Many state verbs, including know and belong, usually take simple forms in their ordinary meanings, so write “I know the answer,” rather than “I am knowing the answer.”

Choose a past form from the time relationship

The past simple reports a completed event or state in a finished past period: “We visited the museum yesterday.” The past continuous uses was/were + -ing for an action in progress at a past moment: “We were walking home when the rain began.” The continuous background and the interrupting event are different, so do not choose both verbs mechanically. The past perfect uses had + past participle to locate a situation before another past reference point: “The bus had left before we reached the park.” It does not merely mean an event happened a long time ago.

The present perfect uses have/has + past participle. It links a past situation with the present: an experience up to now, a present result, or a period continuing into the present. Compare “I lost the key yesterday” with “I have lost the key, so I cannot open the room.” Finished-time expressions such as last Monday normally fit the past simple in standard examination tasks. The perfect continuous, formed with have/has been + -ing, highlights an activity extending over a period: “She has been revising for two hours.” Use since for a starting point and for for a duration.

Future meaning and modal verbs

English expresses future time in several ways. Will may express a prediction, offer or decision; be going to may express an existing intention or a prediction based on visible evidence. Context can make more than one future form possible. A carefully written question must provide enough context for one best answer. In a future time clause after words such as when or as soon as, the present simple is commonly used: “I will call when I arrive.” After a modal such as can, must or should, use the base verb without to: “She can swim.” Modal meanings include ability, permission, obligation, advice and possibility.

Conditions and reported speech

Conditional forms connect a condition with a result. A common first conditional uses a present form with a future result: “If she studies, she will improve.” A second conditional can describe a hypothetical present or future: “If I had more time, I would revise again.” A third conditional looks back at an unreal past: “If I had left earlier, I would have caught the bus.” Read meaning before selecting a pattern. In reported speech, a past reporting verb often causes backshift: “He said, ‘I am tired’” becomes “He said that he was tired.” Pronouns and time references also change when the reporting context requires it.

Active and passive voice

An active clause presents its subject as the performer: “The prefect collected the books.” A passive clause foregrounds what receives the action: “The books were collected by the prefect.” Form the passive with the appropriate form of be plus a past participle. Preserve the original tense and number. Use the passive when the action or receiver matters more than the performer, not merely to make a sentence look formal. In revision, locate time expressions, establish the sequence of events, choose the required form and reread the completed sentence for meaning.

Choose a time relationship, not a memorised label

Begin a tense question by drawing a simple mental timeline. Identify the time of speaking, the event being described and any second event used as a reference point. “When the bell rang, the class had finished the experiment” places completion before the past ringing. “When the bell rang, the class was finishing the experiment” shows an activity in progress around that time. Both are grammatical, but they communicate different sequences. The surrounding passage determines which relationship is needed.

Present perfect and simple past are particularly easy to confuse. “I have visited Kano” presents a past experience as relevant now without naming a finished past occasion. “I visited Kano in 2022” locates the event in a completed past period. In ordinary formal British usage, a phrase such as yesterday normally goes with simple past rather than present perfect. Do not turn that tendency into the claim that every mention of time excludes perfect aspect: “I have worked here since January” correctly connects an earlier starting point to the present.

State verbs and context

Some verbs commonly describe states, including know, own, believe and belong. They do not usually take the progressive when expressing those states: “I know the answer,” not ordinarily “I am knowing the answer.” However, a word may have a dynamic use in another context. “She is having lunch” describes an activity, while “She has two sisters” states a relationship. Decide what the verb means in that sentence before applying a rule about its form.

Habit can be expressed in several ways. “He walks to school” describes a present routine. “He used to walk to school” describes a past routine or state that is no longer presented as current. “He is used to walking” means that walking is familiar to him, and the phrase is followed by a noun or -ing form. These expressions resemble each other on the page but have different structures and meanings. Notice the difference before choosing a cloze answer.

Modals and reported speech

Modal auxiliaries modify certainty, permission, ability or obligation. “The laboratory must be locked” can express an instruction. “The laboratory must be closed; all the lights are off” can express a strong inference. Context decides the meaning. After a modal, use the base form: can swim, might arrive, should revise. Perfect modal forms such as should have revised comment on an earlier action. They do not simply describe present advice with a longer verb group.

When reporting speech from a past viewpoint, tense often shifts backwards: Ada said, “I am ready” becomes “Ada said that she was ready.” Pronouns and time expressions may also change according to who is reporting and when. A universal truth or a situation still accepted as current need not always be shifted mechanically. The goal is an accurate report. Avoid changing a person's promise into a completed event or replacing a definite statement with a possibility.

Conditionals and voice in revision

An open future condition commonly uses present tense in the if-clause: “If it rains, we will move indoors.” A more remote imagined situation can use “If it rained, we would move indoors.” A past counterfactual is “If it had rained, we would have moved indoors.” These examples compare possibilities; they are not instructions to put will after every if. Check the intended time and likelihood together.

For a passive, locate the object of the active clause, make it the subject, and preserve the tense through the appropriate form of be plus a past participle. “The technicians are repairing the generator” becomes “The generator is being repaired by the technicians.” Repairing alone cannot replace repaired in this construction. Self-check: transform “Someone has collected the scripts.” The answer is “The scripts have been collected.” The plural subject requires have, and perfect passive uses been collected.