Explaining why with から less formally

In an earlier lesson, we've already learned that we can use から after a sentence to explain the reason for something.

In that lesson, the part of the sentence ending in から was in the polite form, which sounds very formal. In order to sound more natural, we can better use the plain form in the part of the sentence ending in から, even if the main clause is in the polite form.

In order to use から after a noun or a な-adjective, we add the copula before から.

We can also use から right after an い-adjective or a verb.

Note that these sentences are still in the polite form, and are therefore still polite, even though the clause ending in から uses the plain form. To make the entire sentence casual, we have to use the plain form in the main clause as well.

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