1. they / the environment / We / that / will / are / clean / certain
➩ We will certain that they are the clean environment.
2. i / raining, / Although / is / go to / school. / it / have to
➩ Although it is raining, I have to go to school.
3. suggest / up / beach / I / cleaning / the morning. / in / the
➩ I suggest cleaning up the beach in the morning.
4. If / i / comes / will / you. / Ba / here, / phone
➩ If Ba comes here, I will phone you.
5. Although / she / is / Lan / do / tired, / her homework. / has to
➩ Although Lan is tired, she has to do her homework.