Grammar: (to-) infinitive

We use to-infinitive

• to express purpose. She went to the newsstand to buy a paper.
• after would like, would prefer, would love. I'd like to see a movie on the weekend.
• after too/enough. It's too hot to work.
• after ask, decide, explain, want, hope, promise, expect, refuse, etc. She wants to hang out at the mall.

We use the infinite without to

• after modal verbs. Sally can dance really well.
• after the verbs let, make. Let me give you my number.
• after would rather. I'd rather order take out than cook tonight.