A.Study these examples:
Why don't you buy some new clothes?
Liza said to Mary, "Why don't you buy some new clothes?"
Liza suggested (that) Mary buy some new clothes.
The subjunctive is always the same as the base form (I buy, he buy, she buy, etc.)
I/ he/ she/ it do/ buy/ be, etc.
we/ you/ they
B. We use the subjunctive after these verbs:
suggest propose recommend insis demand
Examples:
1. I suggest (that) you take a vacation.
2. The doctor recommended (that) I rest for a few days.
3. They insisted (that) we have dinner with them.
4. I insisted (that) he have dinner with us.
5. He demanded (that) she apologize to him.
The negative is not + the base form (I not be, you not leave, she not go, etc.):
* The doctor recommended that I not go to work for two days.
* They insisted tha he not bring them a present.
You can use the subjunctive for the present, past or future:
* I insist (that) you come with us.
* They insisted (that) I go with them.
Note the subjunctive be (often passive):
* I insisted (that) something be done about the problem.
* The chairperson proposed (that) the plans be changed.
* The airline recommends that passengers be two hours early.
C. Other structures are possible after insist and suggest:
* They insisted on my having dinner with them.
* It was a beautiful evening, so I suggested going for a walk.
You cannot use the infinitive after suggest:
* She suggested that he buy some new clothes (not suggested him to buy).
* What do you suggest I do? (not suggest me to do)