we did this in groups.句子成分i'm looking forward to doing i

回答：这三个句子是这样组成的：
1.we did this in groups.
↓ ↓ ↓ ↓
主语 谓语 宾语 状语
2.I am looking forward to doing it!
↓ ↓ ↓
主语 谓 语 宾 语
3.The teacher is a very enthusiastic woman called Ms Shen.
↓ ↓ ↓
主 语 谓 语 （系表结构） 定 语
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We did this in groups.
主语 谓语 宾语 介词短语当副词做状语

I am looking forward to doing it!
主语 动词短语进行时作谓语 动宾结构的动名词...