Answer:
Es bueno que ustedes <u>hacen</u> sus maletas para el viaje hoy, en vez de esperar.
Explanation:
<u>Hagan</u> is the past tense or future tense for "do it". For example, "Querio que me <u>hagan</u> ese trabajo en la tarde", which mean, "I want you guys to do that job for me in the afternoon". It could be used to explain what you want multiple people or objects to do.
<u>Hacen</u> is the present tense for "doing". For example, "Me hacen el pelo" which means "They're doing my hair" Its generally used to explain what two or more people or objects do to you. It can also be used to explain what two or more people are doing in the moment or in the present.
<u>Hace</u> is also a present tense for "doing" For example. "Ella me hace el pelo", which means, "She is doing my hair". It is usually used to explain what one object or person is doing to you.
<u>Haga</u> is also used in the past or future tense for "do this/that". For example, "Yo le dije a ella que me haga esto asi," which means, "I told her to do this like this". It could be used as a suggestion/order to someone or something.
Hope this helped - Maria