The past tense is should.
Should is present tense.
The past tense of 'lase' (as in: to use a laser) should be 'lased'.
Learned is generally used for past tense.
Present: Am, are, is, have, has, do, be. Past: was, were, been, has, have, had, did, should.
The past tense is should.
Should is present tense.
It is - as in the past subjunctive 'I should'
The past tense is should. e.g. I should have known better.
Past tense.
You can use should in past tense to say;Should haveShould not have (shouldn't)
Should is the past tense of the verb shall.
Usage of Past Tense or Present Tense is all depends on the topic.
The traditional tense is past tense.
The past tense of 'lase' (as in: to use a laser) should be 'lased'.
Learned is generally used for past tense.
Present: Am, are, is, have, has, do, be. Past: was, were, been, has, have, had, did, should.