These sentences typically begin with “if,” and they always have a subordinate clause that sets the condition and a main clause that states the result of the consequence. If the subordinate clause is at the beginning of a conditional sentence, then a comma after it is required.
Second conditional sentences express hypothetical or unrealistic present or future events. To structure these sentences correctly, the subordinate clause should be in the simple past tense. Then, add a past-tense modal verb (like would, should, or could) followed by the base form of the main verb.
We use them to communicate that something is true or happens only if something else is true or happens—that is, only under a certain condition. Complete conditional sentences contain a conditional clause (often referred to as the if-clause) and the consequence. Consider the following sentences:
There are four types of conditional sentences. It’s important to use the correct structure for each of these different types, because they express varying meanings. Pay attention to verb tense when using different conditional modes. Use a comma after the if-clause when the if-clause precedes the main clause.
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