8.6.15.1) Put the verbs in brackets in the correct form. Give reasons. 1 A: I want (organise) a clean-up day. B: Can I (join) you? 2 A: I'd love (help) poor people in other countries. B: You could money to a charity. 3 A: We should all do something … (protect) the environment. B: Yes, people need to stop … (cut) down so many trees. 4 A; What can I do (reduce) air pollution? B: You could try instead of driving to school. (donate) (walk)

1. A: I want to organise a clean-up day.
   B: Can I join you?
   После want обычно ставим to + infinitive: to organise.
   После can используем bare infinitive без to: join.

2. A: I'd love to help poor people in other countries.
   B: You could donate money to a charity.
   После would love тоже нужен to + infinitive: to help.
   После could идёт обычная форма глагола без to: donate.

3. A: We should all do something to protect the environment.
   B: Yes, people need to stop cutting down so many trees.
   После do something обычно ставим to + infinitive: to protect.
   После stop используется -ing form: cutting.

4. A: What can I do to reduce air pollution?
   B: You could try walking instead of driving to school.
   После what can I do логично использовать to + infinitive: to reduce.
   После try здесь подходит -ing form: walking.

Полностью:

1. to organise, join

2. to help, donate

3. to protect, cutting

4. to reduce, walking