Question

Mr+Smith+cook+nice+food否定句

Answer 1

答案是Mr. Smith doesn't cook nice food.（史密斯先生不会做好吃的东西。）

说明：

1. 在一般现在时的肯定句子里，当主语是第三人称单数时，谓语动词用第三人称单数，在本例里应该用cooks，你一定是丢掉了词尾的“s”。正确的句子是：Mr. Smith cooks nice food.

2. 肯定句变否定句，要先看动词，这里是cooks，它是第三人称单数的行为动词，否定这个动词就要用否定的助动词doesn't + 动词原形cook。

Answer 2

原句cook的形式不妥。
Mr Smith cooks nice food.
否定句：Mr Smith doesn't cook nice food.
Mr Smith cooked nice food.
否定句：Mr didn't cook nice food.

Answer 3

原句有点问题，应该是 cooks.
否定句 Mr. Smith doesn't cook nice food.

Answer 4

Mr Smith doesn't cook nice food