[quote=Unregistered;228448]how do you deal with the subjuctive when using the past tense ?
example:
Teacher requested his student that he study /studied harder.
reply:
The terms
present subjunctive and
past subjunctive can be misleading, as they describe
forms rather than
meanings: the past and present subjunctives are so called because they resemble the past and present indicatives, respectively, but the difference between them is a modal one, not a temporal one.
For example, in "I asked that it be done yesterday,"
be done (a present subjunctive) has no present-tense sense; and likewise, in "If that were true, I'd know it,"
were (a past subjunctive) has no past-tense sense.
In your case I recommend the following:
The teacher asked his student to study harder. 