Answer key
1 've been / have been
The time expressions for and so far are used with perfect tenses, in this case, the present perfect.
The verb be is a stative verb so the present perfect simple, not the present perfect continuous, is the
correct tense.
2 're having / are having
The context shows that they are having a great time at this period of time, so the correct tense is the
present continuous.
3 don't go / do not go
The time expression every day shows that the present simple is the correct tense.
4 explore
The adverb sometimes shows that the present simple is the correct tense.
5 's already made / has already made
The adverb already is used with perfect tenses. The time period is the present, so the present perfect
is the correct tense.
6 didn't make / did not make
The context shows a past time, so the past simple is the correct tense.
7 had left
The context shows that one thing happened before another. The action that happened first is in the
past perfect (he had left our passports behind), and the second is in the past simple (When we got to
the airport).
8 were wondering
The conjunction when shows that one action took place while another action (We were wondering
what to do) was in progress in the past, so the past continuous is needed for the action in progress.
9 offered
The conjunction when shows that one action (offered) took place while another action was in
progress in the past, so the past simple is needed for the action that took place while the other was in
progress.
10 're planning / plan
The time expression tomorrow shows that a future time is being referred to. In this case, the meaning
of the verb plan ("to make detailed arrangements for something you want to do in the future") shows
that either the present continuous or the present simple is the correct tense.
11 're working / are working
When two actions are in progress at the same time in the future, the action in the clause with the
conjunction while (while you're working) is in the present continuous, and the action in the main
clause is in the future continuous.
12 'll be admiring / will be admiring
When two actions are in progress at the same time in the future, the action in the clause with the
conjunction while is in the present continuous, and the action in the main clause (I'll be admiring the
view) is in the future continuous.
13 'll have visited / will have visited
The context shows a future time, and that by that future time (by the time we get back to the States),
the action will be completed, so the future perfect is the correct tense.
14 'll tell / will tell
The context shows a future time, and, therefore, a future form is needed. Phrases such as I
thinkand I promise are usually followed by the future with will.
15 see
The conjunction when introduces a future time clause. The verb in a future time clause needs the
present simple.
