Learn French: Nous détestons cuisiner et ne préparons jamais le dîner. - We hate cooking and never prepare dinner.

It works exactly like ne... pas! You put ne before the conjugated verb and jamais right after it. In this sentence, they go around the verb préparons to make ne préparons jamais (never prepare).

Why isn't there a nous before ne préparons jamais?

Just like in English, you don't always have to repeat the subject if it hasn't changed. Since nous is the subject of the first half, it carries over to the second half. The -ons ending on préparons also makes it perfectly clear who is doing the action.

Why is the verb cuisiner left in its dictionary form instead of being conjugated?

When two verbs appear right next to each other in French, only the first one is conjugated to match the subject. Here, détestons is conjugated to match nous, so the second verb, cuisiner (to cook), must stay in its infinitive (dictionary) form.

Why do we say le dîner instead of just dîner?