When you do, you can use a noun which has the same form as the present participle of a verb.
当你这样想的时候，你可以使用一种和动词的现在分词具有相同形式的名词。
Used with present participle to make progressive form.
与现在分词连用，做进行式。
In English a gerund and a present participle are alike both in form and in some functions, so it is difficult to distinguish them in a sentence.
英语中动名词和现在分词在形式上和某些功能上都相同，在句子中很难区分。
In English a gerund and a present participle are alike both in form and in some functions, so it is difficult to distinguish them in a sentence.
英语中动名词和现在分词在形式上和某些功能上都相同，在句子中很难区分。
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