六年级下册英语第一单元的不定式规则

六年级下册英语第一单元的不定式规则English: The first unit of the sixth grade English textbook introduces the concept of infinitives. Infinitives are formed by placing the word "to" before a verb, such as "to run" or "to eat." In English, infinitives can be used as the subject of a sentence, the object of a verb, or the object of a preposition. They can also be used after certain verbs, such as "want," "need," or "decide." Infinitives can be used to express purpose, as in "I went to the store to buy some milk." It's important
to note that infinitives do not have tense (they are not marked for past, present, or future), and they cannot be used as the main verb in a sentence without the help of another auxiliary verb.
中文翻译: 六年级英语教科书的第一单元介绍了不定式的概念。

不定式是通
过在动词前加上单词"to"而形成的，比如"to run"或"to eat"。

在英语中，
不定式可以用作句子的主语、动词的宾语或介词的宾语。

它们还可以在某些动词后使用，比如"want"、"need"或"decide"。

不定式可以用来表达目的，比如"我去商店买牛奶。

"需要注意的是，不定式没有时态（它们没有过去、现在或将来的表示），而且它们不能在句子中作为主要动词使用，除非获得其他助动词的帮助。