she could be swimming for exercise 为什么用swimming
- 培训职业
- 2025-05-06 01:14:35
这是情态动词的现在进行时的用法，表示推测正在进行的活动。
现在进行时由助动词be的现在式加上动词的现在分词。
动词的现在分词的构成如下：
动词的现在分词，一般在词尾加-ing，但以-e结尾的字则去-e加-ing：laugh—laughing、live--living。但是，-e前为元音，-e要保留。Hoe—hoeing、agree—agreeing，toe—toeing、dye—dyeing、shoe—shoeing、singe—singeing。
以重读闭音节结尾的动词，末尾只有一个辅音字母（x除外），双写末尾的辅音字母加-ing：plan—planning、occur—occurring。非重读闭音节结尾的动词，则不要双写，如：travel—traveling。
以辅音字母c结尾的动词，c后加k再加-ing：traffic—trafficking、picnic—picnicking。
不规则动词的现在分词要逐个记忆：lie—lying、die—dying、tie—tying、vie—vying。
现在进行时表示现在或现阶段正在进行的动作。
The kettle is boiling.
Is the sun shining?
It is blowing hard.
It is snowing outside.
The bus is coming.
John is losing his hair.
She is learning English at college.
He is taking physics this semester.
I am taking the medicine three times a day.
Age is telling on her.
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