It seemed that she was ill.

She seemed ______ ill. (用不定式改写上句)

句型转换:

Our teacher explained how we could write the composition.(用动词不定式改写)

Our teacher explained to us ______ the composition.

Damin showed us how he made the cormorants catch fishes.（用动词不定式改写）

句型转换:

Could you tell me how I can make much progress? (用动词不定式改写)

Could you tell me ______ much progress (进步)?

It is vital that we should learn English well.（用动词不定式改写，句意不变）