Tenses and aspects


Expression Relation
had $TT=$past, $E<TT$
had been $TT=$past, $S<TT$, $E=$progressive
was $TT=$past, $E=$progressive
have $TT=$present, $E<TT$
have been $TT=$present, $S<TT$, $E=$progressive
is $TT=$present, $E=$progressive
will be $TT=$future, $E=$progressive
will have $TT=$future, $E<TT$
will have been $TT=$future, $S<TT$, $E=$progressive