Fill in the blank with the right present perfect tense! He (see) the doctor for several times about his knee, but the doctor doesn't know what is causing his pain.

Put the words in the correct order. Use present perfect tense. the / Daniel /has /returned / books / library / to / the.

Fill in the sentences with verbs in the box using Present Perfect Tense. Then, add "since" or "for". "Since" is used for a starting point, a specific time and "for" is used to express duration. After ...

Work in a group of four. Complete the sentences below about present perfect and simple past tense. We use ____ tense to say how many times we do something so far.

Activity 21 Answer the following questions based on the short dialogs in Activity 20. 4. Where does the smell come from?

Complete the chart below with the correct form of the verb.