The document discusses the present perfect tense in English. It provides the positive and negative forms using have/has + past participle. It then outlines three common uses of the present perfect tense: 1) to refer to a finished past action without specifying when, 2) to refer to a past action that is still ongoing or relevant to the present, and 3) to refer to a past action that affects the present. An example is given for each use.

1. REFERING TO PRESENT AND PAST
PRESENT PERFECT TENSE

2. FORM
positive:
have/has +-ed/irregular
form
negative question
I have worked
I have been
I have not worked
I have not been
Have I worked?
Have I been
He has worked
He has been
he has not worked
He has not been
Has he worked?
Has he been?

3. USE 1: Finished past action, no matter when
I have travelled to Africa

4. USE 2: past action still happening at present
He has lived in Spain for 10 years

5. USE 3: past action affecting the present
She has hurt her leg

6. Watch this video and see what they are refering to in each
situation: