Question

write the correct alternative to fill in the blanks :b) she -(is/has/have )been studying since morning.
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Answer 1

She has been studying since morning.

• The verb used in the given sentence is in the present perfect continuous tense.
• It is used to indicate an action that started in the past and is still continuing at the present moment.
• It can be written as-

Subject + have/has/+ been + main verb + object

As given- She( subject) + has + been + studying( main verb) + morning( object).

Out of all the options given in bracket, 'has' is the most appropriate one as the subject is singular( so 'have' is omitted) and 'is' cannot be added with the present perfect continuous form.

Another example:

We have been studying for an hour.