so(所以)

　　I have lived in Wuhan for five years， so I’m used to the life here.(be used to+n或doing 习惯于…… I’m used to getting up early in the morning.used to do sth. 过去常常做某事 I used to teach in the school.I used to get up late in the morning.)

　　It was already rather late， so we decided to go home.

　　My mother is expecting me， so I must be off now.

　　Mary earns a good salary， so she can’t be deep in debt

　　(be in debt 陷于债务之中)

　　and(并且)

　　Try your best and you’ll succeed this time.(succeed是动词，successful是形容词，success是名词)

　　He shook his head and went away.(shook的原型是shake)