现在时 I am,you are,he is,we are,you are,they are (缩略式 I'm,you're,he's,we're,you're,they're),(否定缩略式 I'm not,isn't,aren't),过去时 I was,you were,he was,we were,you were,they were (过去时否定缩略式 wasn't,weren't),过去分词 been,现在分词 being.
现在时 I am,you are,he is,we are,you are,they are (缩略式 I'm,you're,he's,we're,you're,they're),(否定缩略式 I'm not,isn't,aren't),过去时 I was,you were,he was,we were,you were,they were (过去时否定缩略式 wasn't,weren't),过去分词 been,现在分词 being.