1. I demanded that he should give me the money.

Question

2. I suggested that we should go on a picnic tomorrow.

3. He insisted that she should join the club.

4. I demanded that he give me the money.

5. I suggested that we go on a picnic tomorrow.

6. He insisted that she join the club.

( Are they all grammatical? The other three sentences don't have 'should.')

Answer 1

The sentences without "should" are fine. Adding the word "should" is unneeded since these sentences include subjunctive clauses anyway.