Usage of 'Get' in spoken English

Get is one of the most confusing word in English,  I collected some explanations for it.  

• Two common meanings for get are "receive" and "become." A third meaning (an informal, idiomatic one used mostly in casual conversation) is understand.

Examples:

1. I got a present yesterday.
2. I get tired after 10 km walks.
3. Question #36 is confusing. Do you get it?
4. Thanks for explaining question #36. I get it now.
5. I don't get it. Why do we have to be there  45 minutes early? 
6. I know you thought Bob's joke was funny, but I didn't get it.

• get can also mean answer or respond to a ringing phone or someone who's at the door. 

Examples:

1. The phone's ringing, but I can't get it just now. Can you?
2. I hear the doorbell. Can you get it?   

•  means to buy.

Examples:

1. I got my new shoes at Charlie's Custom Footwear.
2. Where did you get that dress?
3. Will you stop at the store and get some milk?
4. I'll get lunch this time. You can pay the next time.
5. I'm almost out of gas, but I can get some on my way home.
6. If I give you the money, can you get a box of computer disks for me?

•  To retrieve something (and, often, to bring or take it or them to another place or person): 

Examples:

1. The letter carrier just delivered the mail, Can you get it?
2. I think I left my keys in the car.
3. I'd better get them. 
4. Get your coat. We're ready to leave.
5. I think I left my glasses on the kitchen table. Would you please get them for me?

•  Another use for get is in the idiom has / have got.

In American English, the preferred past participle (third form) for get is gotten when get is used in the present or past perfect tenses. It's important to know this because has got and have got look like present perfect tense, but these two forms are actually used like the simple present tense. Also, they use got, not gotten, and they mean has or have. 

Examples:

1. I've gotten several letters this week. ( = I've received = present perfect )
2. I've got several letters. ( = I have = simple present )
3. She's gotten high marks ever since she started school. ( = She's received = present perfect )
4. She's got high marks. ( = She has = simple present )
5. I haven't gotten your report yet. When are you going to turn it in? ( = I haven't received = present perfect )
6. I haven't got your report. You didn't turn it in. ( = I don't have = simple present )  

Special Note:

Many people think that gotten has an "ugly" sound
and don't use it in present perfect tense. Instead, they
replace it with other words that have the same meaning
(for example, received).

• The combinations has got and have got are idioms that mean has or have. They can also be used with to. When they're used in this way, they mean the same as has to and have to ( = "must" or "be required to"): 

Examples:  

1. It's late! I've got to leave!
2. Mehmet can't come to the party. He's got to work. 
3. Your grades aren't very good. You've got to work harder. 
4. Tell Angela she's got to be ready in 10 minutes.  
5. Don't forget that we've got to meet Mr. Brown at 5:00 PM.  

Special Note: Has got to and have got to are almost always contracted to 's got to and 've got to. The "got to" part of each combination is pronounced something like "godda" in everyday speech. Also, the 've is often not pronounced or pronounced very weakly, so you might hear something that sounds like "I gotta go" or "You gotta help me" or "We gotta hurry."   Important: "Gotta" is for speaking, not for writing!