English as a Second Language/doubts in sentences

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Question
Hi Amy...thanks a lot for answering my questions.I always wonder you answer so soon.

Please look at the following set of sentences and guide me
which is correct and why

(1)Doesn't he has anything else to do?

or

Doesn't he have anything else to do?

(2)Since last 20 years I am living here

or

Since 20 years I am living here

Can we add last with since and for.Like for the last 20 years.

(3) He does rounds of the colony

or He does round of the colony

pleas also check the sense in the 3rd sentences.I want to tell about the vegetable seller who again and again comes to out street.So is the 3rd sentence correct grammaitcally and does it make sense or not

Answer
(1)Doesn't he has anything else to do? >>> incorrect

or

Doesn't he have anything else to do? >>> correct

Present tense interrogative/negative form for the third person singular (he) is: does/doesn't he/she/it + verb (infinitive without to)

Does she sing?
Doesn't he drive?

(2)Since last 20 years I am living here >>> incorrect

or

Since 20 years I am living here >>> incorrect

You want to say: I've been living here for the past 20 years.
circumstances here ask for the use of the Present Perfect Continuous: http://www.englishpage.com/verbpage/presentperfectcontinuous.html

Can we add last with since and for.Like for the last 20 years.

(3) He does rounds of the colony >>> correct

or He does round of the colony >>>incorrect

pleas also check the sense in the 3rd sentences.I want to tell about the vegetable seller who again and again comes to out street.So is the 3rd sentence correct grammaitcally and does it make sense or not.  
The first of the two sentences under (3) is fine grammatically and it also makes sense.

I hope this helps Dev.

Best,

Amy

English as a Second Language

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Amy Baker

Expertise

I can answer question about grammar, spelling, syntax, idioms, reading and/or writing that pertain to English as a Second Language. I am knowledgeable about both TOEFL and IELTS.

Experience

I'm a certified ESL teacher with 12 years of experience teaching K-12 and adults.

Education/Credentials
BSc MEd TESL post grad program for k-12 TESL post grad program for adult ed

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