3 Put the verbs in brackets into the present perfect or the present perfect continuous.
1 A: How long
(they/live) in Mexico?
B: For about six years, I think.
2 A: How many times ...
(you/fly) to Australia?
B: Three times.
3 A: Jenny is really nervous about flying.
B: Yes, she
(never/travel) by plane before.
4 A: Alan
around the Old Town all day.
B: No wonder he looks tired now,
5 A: The beaches in Thailand were beautiful!
B: Really? I
(not/visit) Thailand.
6 A: Why are you looking so worried?
B: 1
to our hotel room!
(Walk)
(lose) the key

1. A: How long have they been living in Mexico?
B: For about six years, I think.

Explanation: "How long" suggests a duration, so we need to use the present perfect continuous tense to talk about an action that started in the past and is still continuing. In this case, the action is the time they have been living in Mexico.

2. A: How many times have you flown to Australia?
B: Three times.

Explanation: We use the present perfect tense to talk about past actions that have a connection to the present. In this case, the action of flying to Australia has been completed multiple times in the past.

3. A: Jenny is really nervous about flying.
B: Yes, she has never traveled by plane before.

Explanation: We use the present perfect tense to talk about past actions that have an impact on the present. In this case, Jenny's lack of experience in traveling by plane has made her nervous about flying.

4. A: Alan has been walking around the Old Town all day.
B: No wonder he looks tired now.

Explanation: We use the present perfect continuous tense to talk about an action that started in the past, is still continuing in the present, and has a result or impact on the present. In this case, Alan has been walking around the Old Town all day, and as a result, he looks tired now.

5. A: The beaches in Thailand were beautiful!
B: Really? I have not visited Thailand.

Explanation: We use the present perfect tense to talk about past actions that have a connection to the present. In this case, the action of visiting Thailand has not been completed in the past, so the present perfect tense is used to express that.

6. A: Why are you looking so worried?
B: I have walked to our hotel room and lost the key.

Explanation: We use the present perfect tense to talk about an action that happened in the past but has a connection to the present. In this case, the action of walking to the hotel room has been completed in the past, and the result of losing the key is still affecting the present.