如题所述
1、在句中,有实际意义时的就是 be 动词,没有实际意义时就是助动词。
Lily is a kind of plant. (有实义,表:是。在句中作谓语动词)
The lily has been fully blooming. (无实义。是助动词,与 has 一道构成现在完成进行时)
2、be 为原型动词,与不同的人称代词搭配其形式各异,如现在时:I am, You are, He/She/It is, They are。如过去时,I/Hee/She/It was, You/They were。由于 You 的特性使然,只能搭配复数形式的 be 动词即 are, were。此外,还有 being 和 been 两个分词形式。
3、上述变形在作助动词用时的不同用法:
现在(过去)进行时:Someone is/was looking at TV.
现在(过去)完成进行时:Someone has/had been looking at TV.
被动式:I am reported that my kid has been allowed for the nearest school.
4、要注意区分下列情况:
I am (very) impressed. 这可不是被动式,am 也就不再是助词了。
The lily is blooming gradually. 这个 is 也不是,与上面第二个例句对比一下
Lily is a kind of plant. (有实义,表:是。在句中作谓语动词)
The lily has been fully blooming. (无实义。是助动词,与 has 一道构成现在完成进行时)
2、be 为原型动词,与不同的人称代词搭配其形式各异,如现在时:I am, You are, He/She/It is, They are。如过去时,I/Hee/She/It was, You/They were。由于 You 的特性使然,只能搭配复数形式的 be 动词即 are, were。此外,还有 being 和 been 两个分词形式。
3、上述变形在作助动词用时的不同用法:
现在(过去)进行时:Someone is/was looking at TV.
现在(过去)完成进行时:Someone has/had been looking at TV.
被动式:I am reported that my kid has been allowed for the nearest school.
4、要注意区分下列情况:
I am (very) impressed. 这可不是被动式,am 也就不再是助词了。
The lily is blooming gradually. 这个 is 也不是,与上面第二个例句对比一下
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