feel comfortable doing I feel comfortable when / while I was doing this.为什么能变形为I feel comfortable doing this.

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feel comfortable doing I feel comfortable when / while I was doing this.为什么能变形为I feel comfortable doing this.
feel comfortable doing
I feel comfortable when / while I was doing this.
为什么能变形为
I feel comfortable doing this.

feel comfortable doing I feel comfortable when / while I was doing this.为什么能变形为I feel comfortable doing this.
I feel comfortable when / while I was doing this.
因为主句主语 与 状语从句的主语 一致
这种情况下 可以用分词短语 代替 状语从句
所以能变形为
I feel comfortable doing this.

动词ing在句中作伴随状语。

时间状语从句中 要是主从句主语一致 可以省略主语和be动词