Question

correct tense: for the last three month I (be prepare) for exam​

Answer 1

For the last three months I have been preparing for the exam

Explanation:

• The tense used in the above sentence is the "present perfect continuous tense". The rule for such tense is have/has+been+ -ing. When used  have/has, it implies that the speaker had started the event in the past, however it continues to the present.
• Using the "present perfect continuous tense" focuses on the "activity".  We do not give any specific time. Although the activity is completed, we can see the outcome in the present

Present Perfect Continuous Tense Uses

1. Recent past activities: To talk about any finished activity in the "recent past".

Examples

1. I have just been cleaning the bike. (The bike is wet & clean.)
2. It has been raining. (The ground is filled with water.)

2. Continuing activity: For a single activity which started at a point in the past and still continues (as in the above sentence (preparing for the exam and still is continuing)

Examples

1. I have been reading an interesting novel (I am still reading it.)
2. She has been living in Mumbai since 1985. (She is still living in Mumbai.)

3. Repeated continuing activities

: To talk about "repeated activities" which began at a specific time time in the past and continues up until now:

Examples

1. I have been visiting my grand parents on holiday every year since 2007.
2. She has been playing basketball on and off for four years.

4. How long?: To ask &answer questions about the duration of an activity, example, How long have you been waiting for me?

To know more

the boy is suffering for society. use present perfect continuous tense ...

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