hijacktaffairs

[cunning tinsel]

Please be patient

Our volunteers look into many questions every day; sometimes it takes them a little while to answer.

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Make it descriptive, including relevant context, but also to the point. This way you improve your chances of getting a more relevant and specific answer.

[limber totem]

Well the future tense part in your example is in the subordinate clause whereas the affirmative part is in the main clause

Did you mean to say that what if the sentence is negative but the subordinate is in the future?

Like « Je suis certain qu’il réussira » but « Je ne suis pas certain qu’il … » ?

[fervent plume]

yes

[limber totem]

Okay so you have two choices here. The subjunctive present also implies a future aspect so just using the subjunctive present is fine in that context. However, if you want to emphasise the fact that the subordinate is in the future, you use the simple future

[fervent plume]

so it could be « je ne suis pas certain qu’il réussisse » or « je ne suis pas certain qu’il réussira » ?

[limber totem]

Yup