What is the difference between DO,DID,DOES and IS,AM,ARE, WAS, WERE?
920816
do - used for plural pronouns.\nexample: We do love to play music.\n\ndoes - used for singular pronouns\nexample: He does go to school everyday.\n\ndid - past tense of 1)do and 2)does.\nexamples:1) We did our project last week.\n2)He did his assignments yesterday.\n\nis - used for singular pronouns EXCEPT I.\nexample: He is brushing his teeth.\n\nam - used for the pronoun I.\nexample: I am four_eyed_ninja.\n\nare - used for plural pronouns.\nexample: They are shopping.\n\nwas - past tense of is.\nexample: He was brushing his teeth.\n\nwere - past tense of are\nexample: They were shopping.
867699
Was and Were are both passe tense\nwas is a singlar past tense and were is a more piural\n\n-she was here - refers to one \n-they where here - refers to more than one \n\nis and are can be use differently\nin present tense\n\n-Is she doing her homework-refers to one \n-Are they doing their homework-refers to more than one
308325
[All I did]\nThe phrase inside the square brackets is the subject of the sentence. It consists of a pronoun, "all," and a relative clause, "(that) I did." Note that the relativizer "that" is optional. In your version of the sentence, it has been omitted.\n\n[was review] \n"Was review" is the verb.  [Was]is an auxiliary verb in the sentence.  "Was" is used with the infinitive of the verb "Review" to express intention, obligation, or future action: "what we covered in class."\n\n"what we covered in class" can be thought of as a noun clause.\n\nI hope this helps!
936988
BOOK is the subject. IS is the verb. THIS is an adjective. WHY is an adverb. UNDER MY DESK is a prepositional phrase.\n\nunderstood (YOU) is the subject. GO is the verb. TO THE BACK and OF THE LINE are prepositional phrases.\n\n:)
1027312
You can use both, but it's not a question of "subject/verb" agreement!\nIt's linked to "If" as in "If I were you". It's just a matter of feasability of the action (is it very probable or not).\nAs for the "subject/verb" agreement, it has to be "was" because the only subject is "your answer" and if you had to change the end of the sentence by a singular noun "a photo", it'd stay the same!\nHope it helps!
1113342
You use "then" when you are talking about timing -- something that happens next.\n\n"You ask a question, then you get a bunch of answers."\n\nYou use "than" when you are making a comparison.\n\n"You are hoping that we know more about grammar than you do."\n\nI hope that helps.
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.
698404
As\nSee link below, under "As a Conjunction"...:D
525827
You must say "one does".\n\n"If I were a bird" is a different situation--"were" is the correct subjunctive form of "to be", although many people just use the simple past to express that idea. (If I was a bird)
719448
You can use either when adding a qualifying clause afterwards.\n\n"I like the cat which is red"  "I like the cat that is red" both work. \n\nThat sounds a little more casual/natural.  Which sounds a bit more high brow formal.  \n\nThat can also double as a pronoun.  Avoid using the word "that" twice in a row however.  "That which is wrong"  vs "That that is wrong."
681529
"were" is the correct usage. It's subjunctive usage, meaning that it is imagined or wished or possible, rather than reality.
953123
Well...it actually is debatable, but I'd go with "was" to be on the safe side...\n\nWith either/or (neither/nor) things that contain subjects that take different verb forms, there is no definitive agreement on which form the verb should take.\n\nA majority, however, says that you should follow the subject that is closest to the verb, in this case " I ", so, since:\n\nI WAS asking for refills --> Neither you nor I was asking for refills.\n\nA minority say that the verb should always be singular in these cases, and an even smaller minority say that either verb form is acceptable.\n\nSo your best bet to avoid the ire of an anal-retentive English teacher (or professor, editor, yourself, etc.) is to go with the "closest to the verb" rule, in this case WAS.
647749
The first one is correct.\n\nThe second would be correct if you changed the is to has.\n\nHTH
794114
1. Ask yourself a questions to which this is the answer.\nThe question would be: In which country do people drive on the left? \nThus when you fill the blank in sentence, use "in which". Similarly "where' is also justified, because this sentence answers the question: Where do they drive on the left?.\n\n\n2. Here "is' or "are", is used with "the students", which is plural. Hence "are" is the correct word.
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)
683055
1. is D \n2. is B\n3. is B\n4. is A\n5. is adjective\n\nTRUST ME JUST DID A TEST ON THIS AND GOT THEM ALL RIGHT
538319
A -> B\nB -> C\n...\nT -> U\nYou (U) -> V\nV -> W\n\nSo, You -> V