更新1: 请用中文解释
因为英文有D乱..
The tenses are reflected by the main verb of the sentence.Gerund and To-infinitive do not bear tenses. 2012-04-06 14:46:06 补充： Gerund 动名词 和 To infinitive 都不表达时态。 Gerund 也可以当名词使用。 时态由句子的主要动词和 ttime of adverb 反影。 例： Jogging is a very good exercise. 'Jogging' 是 Gerund 动名词，当名词使用。 动词是 “is” 表达时态是「现在式」。 Tom became strong by lifting weights. 'lifting' 是 Gerund 动名词 动词是 “became” 表达时态是「过去式」。 2012-04-06 14:46:27 补充： Sue taught Amy to play badminton yesterday. “to play ”是 to-infinitive 动词是 “taught” 表达时态是「过去式」。 "yesterday" 是 adverb of time，要和动词时态互相配合。 2012-04-06 15:54:29 补充： Hi Raymond Thank you for your ment. I have over looked the auxillary verbs - 'have' and 'be'. 2012-04-06 15:56:11 补充： The auxilliary verbs have (used to form the perfect) and be (used to form the pasive voice and continuous ect). 2012-04-08 13:40:10 补充： In general
Infinitive do not have tense
ect
moods
and/or voice
or they are limited in the range of tenses
ects
moods
and/or voices that they can use. (In languages where infinitives do not have moods at all
they are usually treated as being their own non-finite mood.) 2012-04-08 13:42:39 补充： However
the auxiliary verbs have (used to form the perfect) and be (also used to form the passive voice and continuous ect) both monly appear in the infinitive. Examples could be refer to Raymond's ment 2012-04-08 13:54:07 补充： 如果 “be” 的作用是被动式 (passive voice)，时态仍由句子中的主词表达。 例： The games is going to be started. “be started” 是被动式。时态由 is going to 表达（在未来）。 例：Infinitive can be used after the direct objects of many tritive verbs “be”在这句子中的 infinitive. “be used” 组成passive voice。 时态是现在式因为这是“fact”； “can”表达出这句子是现在式。 2012-04-08 13:56:02 补充： 不过我们仍需留意不是出现“have” 或 “be” 便一定带有时态。 例： He is going to be late. “be” 在这句子里是 infinitive ；不带有时态。 They are goint to have dinner together. “have” 在这句子里是 infinitive ；不带有时态。 2012-04-08 13:58:45 补充： 当 “be” 和 “have” 以 infinitive 的形态出现，怎样去分别是否含有时态，就要看这两个字后面是可有其他的动词，和跟着 “be” 和 “have” 后面的动词是 - present participle （例： telling等）或 past participle （例：told等）.。
To fghijh
Infinitive (gm) is basic form of a verb such as
be or swim;
an infinitive is used by itself eg swim in:- He can swim or with to (= the to infinitive) as in he likes to swim. Tense bears and depends on auxiliary verb+main verb to infinitive to reflect tense. eg He could have gone to swim yesterday. ---------------He could swim yesterday. Gerund:-a present participle of a verb bears the modal verb+main verb to reflect the tense. eg.He preferred travelling than studying in Old China!.He was fond of swimming when in primary one
private school. This gerund form of verb serving as cases of the INFINITIVE in its noun usage. Modal verbs have only one form where they have no -ing
hence gerund has -ing.Hence the third singular form:He could speak with 3 friends then. -------------------------------------------------He can speak 2 languages now. He will try and visit London(tomorrow) He could invite Susan years ago
but (could) not. Modal verbs are ;-could
can---will
would---may
might---should
shall-----must
ought to
dare
need
----have to
used to------- Treat gerund
infinitive as auxiliary
the English main verb determines the TENSE.
小草
How about the following sentences? The girl is believed to have told the truth. The boy seems to be telling the truth.