When do I use "have" or "has" before a verb? i.e. has begun or began?
352012
Use "have" or "has" if you're looking back at something in the past, which is referring to something further in the past and continued past one event.\n\nI like ice cream.  <-- now\nI liked ice cream yesterday, too.  <-- one event\nI have liked ice cream for a long time.  <-- happened many times in the past\n\nShe begins her homework after dinner most of the time.  <-- now\nShe began her homework late yesterday.  <-- one event\nShe has begun her homework late too many times for her mother to overlook it anymore.  <-- happened many times in the past\n\nI sing this song as much as I can.  <-- now\nI sang it thirty-two times yesterday.  <-- one time (yesterday)\nI have sung it so often by now that I even hear it in my sleep.  <-- happened often in the past
778765
It depends on which is the "subject", and which is the "predicate". "With" would presume association, whilst "By" would suggest Participation.
934555
there are two verbs\n"is"  and "has" \n\nthe subject is Chicago\n(located is not a verb. "locate" is, but located isnt).
1090551
The first one is correct because "lately" implies a link between present and past, and that's the "present perfect" (have slept).\nThe second one is completely incorrect because the tense "present" doesn't draw this link between present and past.
874261
Definitely past tense. You will make statements about things that "have happened" in the past, as opposed to things that "are happening" in the future.
548680
"knew" is "know" in the past tense. Since "did" is already in the past tense, no need to repeat it twice.\n\nSame with every verb: I didn't go (not didn't went)\nI didn't swim (not didn't swam)
1158726
however, not all native English speakers write or speak grammatically correct.\n\ni spot an error that could be overlooked by many in your sentence. "........., the first thing they usually mention is.."\n\nwould be better if "...........the first thing they usually mention has.."
52652
'get' is correct. The verb which needs to be in past tense is 'to do', not 'to get'
947082
"Did play" is the  verb. Did (past of do) is part of the verb phrase, or predicate along with "play."  Kim is the subject, and soccer is the direct object which receives the action of the verb. \n\nHope this helps.\n\nSue
833391
Are you discussing a class in school?  Or are you discussing the grammatical "simple subject"?\n\nIf it is a class, that totally depends on your interests.\nIf it is part of grammar, that would be You, "I", "He", "She", or "It". An example would be "I ran."   I is the simple subject, ran is the verb.
1006994
I don't really understand your question.  Do you mean from past tense to present or from a simple sentence to a complex one or what?  Please add details.
379436
In response to your first question, the use of the word "their" in this case is quickly becoming colloquially acceptable in replacement of "his or her" or "your."  This has always been an awkward point in the English language.\n\nIn the second case, the use of "since" implies that the action is still taking place, but the use of "were" implies that the action has been completed.  Therefore, if these cultures still exist and are agricultural, "have been" is correct.  If these cultures no longer exist, then "since" must be eliminated in favor of something more clear.
741869
"Had drunk" is incorrect.    "Drunk" is a state of being. "Drunk" is often used as an adjective or adverb.\n\n"I had drunk" may be correct, but it is very clumsy and the thought can be expressed more gracefully.  See my example sentence below.\n\n"I drank" is a verb phrase, meaning the subject "I" had consumed a liquid beverage the previous night.\n\n"I drank so much last night I became very drunk."\n\n"Drank" is the verb.   "Drunk" is an adjective.
414921
Sentence number 2 is correct.\n\nThe reason sentence 1 is not correct is because it has a dangling participle. In other words, the participle cannot distinguish what it wants to describe. \n\nIt could be that you realize how much different you have been than before (like in sentence 2)\nOR------\nit could be that you realize how FREQUENTLY you have been different than before.\n\nIf you read sentence 1, you will realize that both senerios could be true. \n\nHope this helps\nThanks\nJon
379535
Both are correct English. The first would be the most common circumstance. Which is more correct would depend on the context of the situation.
867419
No, it isn't correct.  Correct usage would be, "Has he got the money?" or "Did he receive the money?" or "Has he received the money?"
640980
Both sentences are grammatically correct when examined alone.\n\nThe first is talking about a situation in the present.  You would use this expression when you give a gift to someone.\n\nThe second is talking about a future situation.  You would use this expression when you were talking about a movie that the other person plans to see in the future.