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.
Modal verbs are for example may, can, must, should, need. They express an ability, permission, wish etc. to do something. (I may, can, must swim.) Many modal verbs cannot be used in all of the English tenses. That's why we need to know the substitutes to these modal verbs.
Shall is not used often in modern English especially in American English. In fact, shall and will have the same meaning and are used to refer to the simple future.
Modal verbs, sometimes called modals, are auxiliary verbs (helping verbs). They express such things as possibility, probability, permission and obligation.
Auxiliary means functioning in a supporting capacity, and that is exactly what these auxiliary verbs do, which is why they are also known as helping verbs. They are used together with a main verb to give grammatical information and therefore add extra meaning to a sentence; information that is not given by the main verb.
Before you begin the verb tense lessons, it is extremely important to understand that NOT all English verbs are the same. English verbs are divided into three groups: normal verbs, non-continuous verbs, and mixed verbs.
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