Learn Dutch: Jullie moeten snel besluiten en een bod doen. - You have to decide quickly and make an offer.

The conjugated modal verb moeten (must / have to) sits in the second position of the sentence and pushes the main action verbs to the very end. Since you have to do two things—decide and make an offer—both besluiten and doen stay in their full dictionary form (infinitive) and wait at the end, joined by en.

Why does the Dutch sentence use doen instead of maken for "make an offer"?

Languages often pair specific verbs with specific nouns. While in English you "make" an offer, in Dutch you "do" an offer (een bod doen). It is best to memorize this as a fixed phrase rather than trying to translate the English verb directly.

Is there a difference between besluiten and beslissen?

In everyday Dutch, not really. Both mean "to decide" and are used interchangeably in most situations. Besluiten can sometimes sound slightly more formal, but as a beginner, you can comfortably use either one.

Could I put snel at the very end of the sentence, after the verbs?

No, you cannot say Jullie moeten besluiten snel. Because the modal verb moeten forces the main verbs to the very end of the clause, adverbs like snel (quickly) must come before them.