In time clauseA group of related words containing a subject and a verb.s that refer to future time (for example clauses with after, as soon as, until, when, while etc.) we use present tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses.s.

The actionA general term expressing that somebody or something does something expressed by the past participle happens before or at the same time as another one. The participle replaces a clauseA group of related words containing a subject and a verb. with a passive verbA part of speech that expresses an action or a state. E.g.: John seldom plays tennis..