1 用作目的狀語。
He has gone to Shanghai to look for a job. 他去上海找工作了。
She studied hard to pass the exam. 她刻苦學習,以便能通過考試。
2 用作程度狀語。
This book is easy to read . 這本書容易讀。
The work is difficult to do . 這項工作難做。
3 用作結果狀語。
The girl is too young to look after herself. 這個女孩太小,不能照顧自己。
The tree is too tall for him to climb . 這棵樹太高,他爬不上去。