價格：免費
更新日期：2016-06-01
檔案大小：9 MB
目前版本：1.0
版本需求：需要 iOS 8.0 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
The verb to be, like the verb to have is one of the key verbs in English. It is used as a copular verb to link subjects to adjectives, as a helping or auxiliary verb in continuous tenses, and is used as the auxiliary verb in all passive tenses. Here are clear explanations of the various uses of the verb to be.
Am Is Are
Three of the most common forms of the verb to is are am, is and are. These are the conjugated forms of the verb to be in the present.
I am You are He is She is It is We are You are They are
Am, is and are are sometimes confused, but remember that am is only used with the subject I, all other subjects take is or are.
Remember that am, is and are are used in the present tense.
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