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。
When you do, you can use a noun which has the same form as the present participle of a verb.
中文意思：掌握现在完成时态以及不规则动词的过去时态和过去分词…
To grasp "the Present Perfect" and the Irregular verbs' past tense &past participle tense.
中文意思：掌握现在完成时态以及不规则动词的过去时态和过去分词…
To grasp "the Present Perfect" and the Irregular verbs' past tense &past participle tense.
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