When the Dependent clause is introduced by some Conjunction of Comparison, Rule - I
has no existence whatever. Any Tense can be followed by any Tense.
Principal Clause….Dependent Clause
1. He helps you more….than he helped me.
2. He helps you more….than he helps me.
3. He will help you more…. than he has helped me.
4. He has helped you more…. than he helped me.
5. He helped you more…. than he is helping me.
6. He will help you more….than he was helping me.
If the comparison is expressed by AS WELL AS instead of THAN, the same rule holds good. Any tense may be followed by any tense, according to the sense intended by the speaker.
1. He helps you as well as he helped me.
2. He will help you as well as he has helped me.
If no Verb is expressed after THAN or after AS WELL AS, the Tense of the Verb understood in the Dependent clause is the same as that of the Verb expressed in the Principal clause.
1. He helped you more than he helped me.
2. He will help you as well as he will help me.