Prepositions are short words (on, in, to) that usually come before nouns (sometimes also in front of gerund verbs). They never change their form, regardless of the case, gender etc. of the word they are referring to. There are hardly any rules for learning prepositions The best way to learn them is checking them in an advanced dictionary, reading a lot, and memorizing useful phrases. Prepositions are important because they work to connect various parts of a sentence. Prepositions tell us where something is in relation to something else or how things are related in space --in, on, to, with, over, under, onto, into, beside. or where so/sth is going (to church). Others show physical connections or possession between nouns or pronouns and another word such as of, with, by. Some refer to relationships in time while, during, after, until, before, since.

True conditional sentences are subject to certain terms or imply conditions or preconditions or involves possibilities or assumptions or suppositions (hypothetical). In other words, the conditional is not anticipated to occur unless certain terms are met. Mixed conditionals are conditional sentences that combine two different types of conditional patterns. They are usually a combination of a 2nd conditional and a 3rd conditional or a 1st conditional and a 2nd conditional.

Many native English speakers convert nouns and proper nouns into verbs (by changing the position of the noun in a sentence) and like the fact English gives them the freedom to ‘verb’ nouns and ‘noun’ verbs and feel it allows them to communicate more efficiently. Even some irregular verbs allow –ed in certain situations.

The -ing of verbs can also have the force of adjectives or nouns. When a verb ending in -ing acts as a noun it's called a gerund. A gerund can be the object of the main verb e.g. Do you like skiing? or a gerund can have its own object e.g. He likes singing rap.

It is usual for the verb to follow the subject. e.g. Mike called home. We're leaving tomorrow. However, in many sentences the subject and the verb are inverted for reasons of style and emphasis.

Is any of you married or Are any of you married? What would a grammarian say and what would a native speaker say? Which one you choose depends on whether you are looking at the whole or the parts.