Practice NET Natural Sciences questions with answers and explanations.
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'Ought to' expresses advice or moral expectation.
Seeing a doctor is recommended if the condition continues.
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'Could' expresses general ability in the past.
The time phrase 'when she was five' requires a past modal.
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'Should have' expresses criticism or regret about a past action not performed.
The speaker believes earlier information was the proper action.
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'May have' expresses a possible explanation for a past event.
The evidence is suggestive but not conclusive.
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'Must be' expresses a strong logical deduction based on evidence.
The long working period makes exhaustion highly likely.
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'Must not' expresses prohibition.
'Need not' would mean the action is unnecessary, not forbidden.
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'Need not' means there is no necessity to bring food.
It does not imply that bringing food is forbidden.
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'Shall we' is commonly used to make a suggestion or seek agreement.
The speaker is proposing that the presentation begin.
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'Should' gives advice or recommends a sensible action.
Regular practice is presented as the proper course.
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'Cannot be' expresses a strong negative deduction.
The recent sighting at the office makes his being at home impossible.
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'Need not have bought' means the action was completed but proved unnecessary.
It differs from 'did not need to,' which may mean the action was not done.
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A simple-present negative with a third-person singular subject uses 'does not.'
The main verb remains in its base form.
