Where’s Sally, Jack?
She’s in the garden, Jane.
What’s she doing?
She’s sitting under the tree.
Is Tim in the garden, too?
Yes, he is.
He’s climbing the tree.
I beg your pardon?
Who’s climbing the tree.
Tim is.
What about the dog?
The dog’s in the garden, too.
It’s running across the grass.
It’s running after a cat.
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现在进行时
在英文中若想表达此刻正在进行的动作或事件，要用动词的现在进行时形式。现在进行时由be的现在时形式（am, is, are）+现在分词组成。如课文中的Shes sitting under the tree 和He‘s climbing the tree等句子均为现在进行时。对大多数动词来说，在动词后面直接加-ing即可构成现在分词，如doing, climbing。以-e结尾的动词，要去掉-e，再加-ing，如making。如果动词只有一个元音字母而其后跟了一个辅音字母时，则需将与辅音字母双写，再加-ing，如running, sitting。
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疑问式：将用了现在进行时的句子变成一般疑问句时只需将助动词提前。如：
- He’s reading a magazine.
- Is he reading a magazine?
他正在看一本杂志吗？
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否定式：现在进行时的否定式是将否定词not放在助动词之后。如：
- The dog is drinking its milk.
- The dog is not drinking its milk.
狗没在喝它的那份牛奶。
学习链接：http://www.tingroom.com/lesson/nce1/199.html