to suggest that - struggling with subjunctive

1) I suggest that he pour the liquid while holding the container with two hands.

2) I suggested that he pour the liquid while holding the container with two hands

(The following is US usage.)

1. The given sentence is okay grammatically, but the context would have to fit. Some examples of correct usage:

A: He's only 4 yrs. old. Do you think he can manage pouring the liquid?
B: (If he's only 4) I suggest that he pour the liquid holding the container with two hands.

C: In this section of the video the child is having troubl

You are probably correct about the subjunctive, but there is a better solution,namely the -ing structure:
I suggest pouring the liquid while holding the container with both hands.

That is a good idea. What I find more difficult is in the past tense though.
Would "I suggested pouring the liquid..." be ok

diotimaMy mother tongue has a present and past subjunctive and it usually changes according to the tense of the main verb.

Ah! That could be a problem then. You'll have to train yourself to use just the mandative construction (~ present subjunctive) no matter what tense the main verb has. This is one reason why it is probably better to say that English has

diotimaWould "I suggested pouring the liquid..." be ok

Yes. The -ing word has no tense of its own; only the main verb that precedes it carries tense.

I [suggest / suggested / will suggest / would suggest / have suggested / had suggested] pouring ....

CJ

wow, thank you for the clarifications, very helpful!

Grammatically correct, but 'suggest tht' sounds a bit clumsy. Much better English with an -ing structure, e.g.
I suggest / suggested pouring out the liquid while holding the container with both hands.