不一定.要具体情况具体分析.例如：
Ｓhe makes us laugh .
He helps wash the clothes .
Let us go .
I saw the girl run away.
以上句子中,laugh,wash ,go ,run 都是动词,并没有变成名词.
如果一个动词是及物动词,那么它后面的动词形式大概有下面几种：
１,动词原形,如上面的例子；
２动名词,如：They enjoy living here .He keeps studying hard .I finished reading the book.
3,不定式,这种形式最多,举一个例子：Ｉwant to buy a book.
4,分词,即现在分词和过去分词.