"Keep an Eye on"

Definition - to keep close watch on, to look after carefully

Examples:

I have to run to my car, can you keep an eye on little Jimmy for me until I get back?

I think I left my wallet in the house, can you keep an eye on my bicycle for a few minutes?

A phrasal verb is either:

* a verb and a preposition
* a verb and an adverb
* a verb, an adverb, and a preposition

Phrasal verbs are often used in informal speech, between family and/or friends. They are used very commonly in the English language.

The best thing to do is to memorize them. It isn't necessary to know all of the phrasal verbs to be able to have a conversation. You can use other verbs to communicate the same information. Although, it is important to at least commit them to memory so that when you hear them, you will understand what the person is saying.