The auxiliaryA helping verb used with main verbs to express mood, voice and tense. E.g.: I can't stand when I am disturbed. ("can", "am") can is used here to express capability.

Winters in Minnesota can be really cold.

For annoying habits, typical of a person we can use would. This usage sometimes implies criticism and has an emphaticSpecial importance or attention given to something. E.g.: All I wanna do is have some fun. effect:

In time clauseA group of related words containing a subject and a verb.s that refer to future time (for example clauses with after, as soon as, until, when, while etc.) we use present tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses.s.

If we want to emphasisSpecial importance or attention given to something. E.g.: All I wanna do is have some fun.e the length of the period of timeThe length of time between two points of time. that has passed since a past eventA general term expressing that somebody or something does something or that something happens. E.g.: An apple fell on Isaac’s head., an introductory it is used with the present perfectThe aspect expressing completion. E.g.: He’s finished university. tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses..

The present perfectThe aspect expressing completion. E.g.: He’s finished university. tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses. is often used with superlative forms of adjectiveA part of speech that modifies, qualifies or restricts a noun or a pronoun. E.g.: The apples are ripe. ("ripe")s to express emphasisSpecial importance or attention given to something. E.g.: All I wanna do is have some fun..

This is the first time I have been to Prague.
This is the worst film I have ever seen.

This use also applies to the past perfect tense.

The auxiliaryA helping verb used with main verbs to express mood, voice and tense. E.g.: I can't stand when I am disturbed. ("can", "am") DO for emphasisSpecial importance or attention given to something. E.g.: All I wanna do is have some fun. in present simple

In present simple we can use the auxiliary do/does in affirmativeA declarative sentence indicating "yes"; also called a positive sentence. E.g.: John likes squash a lot. sentences to express emphasis. In such a case the infinitive form of the verbA part of speech that expresses an action or a state. E.g.: John seldom plays tennis. is used. In speech the auxiliary is stressed.

If + subjectThe person or thing that performs the action of a verb or that is described by a verb. E.g.: Andy has never been to Brunei. ("Andy") + auxiliaryA helping verb used with main verbs to express mood, voice and tense. E.g.: I can't stand when I am disturbed. ("can", "am") can be replaced 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. English, or for dramatic effect, by the inversionA structure in which a verb or an auxiliary precedes the subject. E.g.: "Here comes the sun." of the auxiliary and the subject, with the if omitted.