NET Natural Sciences MCQs

The present perfect is formed with 'have' plus a past participle.
'Ever visited' asks about experience up to the present.

Future time clauses after 'as soon as' normally use the simple present.
The future meaning is carried by the main clause.

The past continuous uses a past form of 'be' plus an -ing form.
The plural subject 'they' takes 'were.'

The main action will happen in the future after another future-completed action.
The main clause therefore uses 'will call.'

'Must' expresses a strong obligation or legal requirement.
Wearing a seat belt is presented as compulsory.

'May' is used to ask for permission in a polite, formal way.
The sentence requests permission to borrow the pen.

The preparation was completed before the guests' arrival.
The past perfect shows this earlier completed past action.

The action will be in progress at a specified future time.
The future continuous tense expresses this situation.

The degree will be completed before a stated future deadline.
The future perfect is used for such completion.

'Yesterday' is a definite finished past time.
The simple past is required rather than the present perfect.

The temporary action happening today contrasts with a usual habit.
The present continuous expresses the temporary situation.

The sentence describes a repeated habit in a finished past period.
The simple past is appropriate.