Is the verb tense past perfect, present perfect or future ...

Is the verb tense past perfect, present perfect or future perfect? ‘The physicist has calculated the trajectory of the particle.’

A. Past perfect

B. Present perfect

C. Future perfect

D. Simple past

Select your answer:

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What is NOT a connotation of mothers

A. Nurture

B. Caring

C. Trust

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Change the active sentence to passive.

Everyone must switch off their cell phones.

A. Cell phones must switched off.

B. Cell phones switched off.

C. Cell phones must be switched off (by everyone).

D. Switch off everyone’s cell phones.