Verbs in English can be divided into two groups: Transitive verbs and Intransitive verbs. What are transitive and intransitive verbs? While the concepts might sound difficult, they are easier to understand when you think about the verb and whether there is an object receiving the action of the verb.
A preposition of place is a preposition which is used to refer to a place where something or someone is located. There are only three prepositions of place, however they can be used to discuss an almost endless number of places.
A preposition of time is a preposition that allows you to discuss a specific time period such as a date on the calendar, one of the days of the week, or the actual time something takes place. Prepositions of time are the same words as prepositions of place, however they are used in a different way.
In some cases, unreal conditional sentences are mixed. Namely, the time in the If-Clause is not the same as the time in Main Cause. When it is so, these sentences or clauses are called mixed types or mixed conditionals.
The conditional sentences indicate us a possible condition and its probable result. It means that the expected actions depends on a condition. If Clauses – Type 2 is used to express dreams, unreal situations and things that are unlikely to happen.
The conditional type 1 refers to a possible condition and its probable result. These sentences are based on facts, and they are used to make statements about the real world, and about particular situations. We often use such sentences to give warnings.
In zero conditional sentences, the tense in both parts of the sentence is the simple present. This conditional is used when the result will always happen. So, if water reaches 100 degrees, it always boils. It's a fact. I'm talking in general, not about one particular situation. The result of the 'if clause' is always the main clause.