Traveling

Modals
- Must (+), musn't (-)
- Should (+), shouldn't (-)
- Might
- May
- Shall
- Can / Could
- Will / Would

Modals-like
- Ought to
- Have to (+), don't have to (-)
- Had better

Describing necessity
- Have to
- Must
- Don't have to
- Musn't

Giving suggestions
- Had better
- Ought to
- Should
- Shouldn't

Example :
a). You must get a passport
b). You shouldn't pack too many clothes
c). You should buy a roundtrip ticket
d). You ought to make hotel reservations
e). You have to get health insurance
f). You'd better check the weather
g). You shouldn't carry lots of cash
h). You ought to get traveler's checks
i). You don't have to take a lot of luggage
j). You must check on visas
k). You shouldn't carry your wallet in a back pocket