【问】 He does speak well!请分析句中does的用法。

【答】 英语的助动词do有一个很主要的用法：在肯定句中表示强调。应注意，在这种用法下它只有现在时(do，does)和过去时(did)。这种用法叫做强调肯定式(emphatic positive)，其作用在于排除否定性的观点：

1. So you did come after all. (Dreiser)

你毕竟还是来了。

2. But I do think you are a good cook.(CGEL)

但是，我确实认为你是个好厨师。(暗含的意思：你可能以为我并不这样认为。)

3. So you did go to the concert this evening. (CGEL)

这就是说，你今天晚上真的去听音乐会了。(暗含的意思：我原以为你没有去呢。)

4. “You should listen to your mother.”

“But I do listen to her.”

“你应该听你母亲的话。”

“我是听她的话啊。”

5. He thinks I don't love him，but I do love him.

他认为我不爱他，但我确实是爱他的。

do的这种用法是托福题的一个考核项目：

1. “Are you going to stay at the lake?”，“If I_______，I'll let you know. ”

A. will stay B. staying C. do stay D. stayed(TOEFL，74. 6)

2. “Cars moved very slowly in the 1920’s.” “Yes，but，they________ move more quicklythan in 1910. ”

A. were to B. did C. will D. can(TOEFL，72.10)