1. can / my / can't / swim / but / sister / dance / she 2. mountain / or / beach / should / to / go / we / to / the / the / ? 3. a / watch / family / 1/ tonight / my / movies / and / will / horror

When we unscramble the sentences, we have:

1. My sister can't swim, but she can dance.

2. Should we go to the mountain or to the beach?

3. My family and I will watch a horror movie tonight.

Explanation:

When unscrambling sentences, first locate the verbs to have an idea of what the sentence is about. The number of verbs usually helps predict the number of subjects as well. Then, look for names or nouns and pronouns (such as "I", "he", "she") which can function as subjects. At this point, you will have a good idea of what the sentence is about, and will be able to place the rest of the words appropriately.

Sometimes, as is the case with sentences 1 and 2 above, more than one combination is possible. Let's see the other possibilities below:

1. My sister can't dance, but she can swim.

2. Should we go to the beach or to the mountain?