1.use (although ) 作句
e.g:Although the test was difficult,he got full marks.
2.USE(but) .....
e.g:Terry is not clever,but he is hard-working
3.USE (To).......
e.g:TO purse higher qualifications,he studies very bad
4.USE (In order to).......
e.g:In order to finish the task earlier,he works from morning till night
5.USE(so as to).......
e.g:He works from morning till night so as to earn much money