Determiners precede and modify nounA part of speech that names a person, place or thing. E.g.: The koala is a marsupial. ("koala", "marsupial")s. Some determiners can only be used with countable or uncountable nouns, while others with both. Countable nouns take a singular or plural form depending on the determiner which precedes them (sing: singular form; pl: plural form):

Time is a concept which is related to our perception of reality. There are three times: past, present and future. Tense is a grammatical category which is marked by verbA part of speech that expresses an action or a state. E.g.: John seldom plays tennis. inflectionA change in or addition to the form of a word that shows a change in the way it is used in sentences. E.g.: He likes what you cooked. ("-s", "-ed") and expresses when an eventA general term expressing that somebody or something does something or that something happens. E.g.: An apple fell on Isaac’s head. or actionA general term expressing that somebody or something does something happens in the flow of time.

These structureThe way in which the parts of a sentence, clause or expression are arranged. E.g.: make somebody + infinitive in "The teacher made me rewrite the composition."s are used mainly in formalNot belonging to colloquial or everyday speech; official. E.g.: I demand that Mr Smith call the person on whom the committee has decided. or literary language for rhetorical effect.

AffirmativeA declarative sentence indicating "yes"; also called a positive sentence. E.g.: John likes squash a lot. forms

Used to and would are both used for past habits. There is, however, a difference between the two. Would describes repeated actionA general term expressing that somebody or something does somethings, but not stateA condition that exists at a particular time. E.g.: I am sick. This melon weighs two kilos. s, while used to can refer to both repeated actions and states.