There are some special conditional forms for modal verbs in English:would + can = couldwould + shall...

A: We use Could 'Should have + past participle' can mean something that would have been a good idea,...

A: Could have + past participle means that something was possible in the past, or you had the ability...

English speakers often use THE plus a singular noun when they talk about or make generalizations about...

An infinitive is the "to" form of the verb. The infinitive form of "learn" is "to learn." You can also...