have的过去式是had,现在分词是having.而have的意思是 有；让；拿；从事；允许.
am的过去式是was,比如I was a student tomorrow.我昨天是个学生.而were是are的过去式you were student tomorrow.你们昨天是学生.
be动词有am is are,在一个句子中没动词用be动词比如I am a student.在提问时就是am i a student?我是一个学生吗?在任何句子中都会有动词.
to是到；向；（表示时间、方向）朝…方向的意思比如go to school去学校.go to home回家.
his是他的意思.Every man has his weak side.每个人都有脆弱的一面.
for是为,为了；因为；给；对于；至于；适合于的意思Doctors say it is good for us.
医生说这对我们是有好处的.
of是关于；属于；…的；由…组成的意思 Several of his friends gave him gifts.他的一些朋友给他送来礼物.