"Me" has its place in the English language, but most people incorrectly use "I" when they should use met. Me is an object form, and you must use it when you need an object. For example, "This is between you and I" is incorrect, because an object of a preposition (between) is needed, so you must say,"This is between you and me." Me can also be a direct object or indirect object in a sentence, but the mistake is made most often when using prepositions. Me is the only form that can be an object of the preposition.
Who is the subject form of a sentence, and whom is the object form. For example: "Who will be selected to attend the seminar?" "Who is the attendee?" (Who is the subject in each.) Or: "I do not know with whom you are going." In this sentence whom is the object of the preposition with. "She loves whom?" Whom is the direct object in this question. "They awarded the money to whom?" An object of the preposition "to" is needed.
The tricky aspect of the straightforward who or whom rule is when you have two clauses working together. In this situation, you must look within the clause to see if a subject or an object is needed. In the example, "I don't know who started all the fuss," who is the subject in the secondary clause "who started all the fuss." When there is more than one clause, you have to take a close look at how the pronoun is being used within that clause, as a subject or object.
It sounds so simple: Use singular verbs with singular subjects and plural verbs with plural subjects. However, verbs that end in s, unlike nouns, are singular. Dropping the s on the end makes the verb plural. For example, "She uses a computer every day." has singular subject-verb agreement, whereas "They use a computer every day." is plural. Some forms of a verb are irregular and just need to be memorized: "is" is singular and "are" is plural; "has" is singular and "have" is plural; "does" is singular and "do" is plural; "was" is singular and "were" is plural. "She was there before 7:00 p.m." has singular agreement. "They were there at 4:15 p.m." has plural agreement. You and I are pronouns that are treated as if they were plural because they sound better with plural verbs: "You has a book of mine." is incorrect. "You have a book of mine." sounds better and is correct. You and I break the rule and are treated as plurals.