[請益]請教一句句子的文法

[kira12109 (三つ葉)]

He maintained all he did was restrain her from assaulting him by holding her.

為什麼was restrain 兩個動詞可以併用呢?

另外想請板上高手解惑一下這句子的文法結構~謝謝

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推 jklkj:這句的結構就是All I want to do is finish my work.
推 jklkj:你的那句was後面要加原型~~~不過我不知道怎麼解釋!!!sorry
推 mongjhesie:All I want to do is (to) V
推 hownever:推樓上。省略to
推 pptuser:all he did名子句 (子句的主詞)加was動詞 r後面是be動補語