Learn French: Il ne veut pas lâcher le jouet. - He does not want to drop the toy.

You would say Lâche-le ! As you are learning in this lesson, in affirmative commands, the direct object pronoun (le for "it", replacing le jouet) attaches to the end of the verb with a hyphen. Also, remember that for -er verbs like lâcher, you drop the final s in the tu form of the command (lâche instead of lâches).

If I want to change the sentence to "He doesn't want to drop it", where does the pronoun go?

It becomes Il ne veut pas le lâcher. Even though in commands like Lâche-le ! the pronoun goes at the end, in a standard sentence with two verbs, the pronoun goes immediately before the infinitive verb it belongs to (lâcher).

Why isn't lâcher conjugated here?

When you use two verbs together in French to express a single idea, only the first one is conjugated. Since veut (wants) is already conjugated, the second verb, lâcher (to drop), stays in its infinitive (dictionary) form.

I thought "to drop" was translated using tomber. Why does this sentence use lâcher?