Susan: I want you to give me a diamond ring for my birthday.

Peter: You know very well that I can't afford ____________ it.

We use the full infinitive before "too" and "enough".

I would prefer _____________ ice cream rather than drink milkshake.

We are sorry ___________ that your passport has expired.

We use the bare infinitive after modal verbs.

My mother helped me _____________ dinner.

She promised _____________ anything.

He always agrees ___________ the housework and __________ grocery shopping in the afternoon.

We use the gerund as a subject (noun) or an object.

I usually look forward to _________________ the weekends with my parents in Santiago.

Nothing compares to ___________________ you near.

I am used to _____________ early every day.

This is the perfect ending to the bad day I'd gotten used to _______________.

Bob: Ahhh, I need some holidays!

John: Are you that tired?

Bob: Yeah. I've been working long and hard but I have to carry on.

John: Come on Bob, relax! There's no point in ____________ stressed.

Karen: Don't tell me it's not worth _____________ for.

Anne: Yeah, if at first you don't succeed, try, try again.

We use the gerund after the verb "go" for free-time activities.

He _________________ flowers last year.

Don't __________________ me the photos.

She ________________ soccer after she hurt her knee.

The modal verbs "must", "have to", "can", "may", and "might" take an s, -ing, or -ed suffix. For example: He musts go to school.

In questions (?), the modal verbs come before the noun.

We use this modal verb to express duty, strong obligation and show that something is essential.

You ____________ obey the law. (it's mandatory to obey the law).

To express prohibition we use:

If you haven't been able to get her attention, maybe you should try ________________ her flowers.

We use the modal verb "have to"

We form questions with the auxiliary verb to do and the modal verb "have to".

It's not necessary but if you want you can do it.

We use the modal and auxiliary verb "can":

Be careful. The noodles in this restaurant can be very spicy even though I always say ‘No chili please!’.

We use it to express lack of ability.

You ____________ borrow my car tonight; I need it.

We use "May" and "Might" to:

Hillary Clinton: President Trump, __________ I go outside for a while?

Donald Trump: Certainly.

We can only use "may + not" to deny permission.

A: Where are the children?

B: They ___________________ in the backyard.

A: Why are you so sure?

B: Because I saw them five minutes ago.

Jem: Blond hair, nice body and so lovely. That woman up there is Shakira.

Laura: Mmm... She _____________ Shakira. She is very tall and fat, besides I haven't seen anybody asking for an autograph.

I'm sure they have not arrived yet.

I did something wrong yesterday night. I _______________ crazy.

A: I'm very happy.

B: Why?

A: Because we are close to ______________ the level.

Prior to ________________ the lesson you must take students to the computer lab.

The present infinitive refers to the present or the future. For example, he wants to travel to China next year.

Students come here every day _______________.

Is this sentence correct? "He is believed to be working as a pimp".

A: You look terrible.

B: Yeah.

A: You __________ see a doctor right now.

What kind of "infinitive tense" is this sentence?

"She believes to have seen a living dodo".

They expect to have been waiting for the right person to talk to.

They are said _________________ on a remote island.

I need a pay rise. I claim ____________________ very hard lately.