1. We will certain that they are the clean environment.

2. Although it is raining, I have to go to school.

3. I suggest cleaning up the beach in the morning.

4. If Ba comes here, I will phone you.

5. Although Lan is tired, she has to do her homework.

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.