1. Watch out for fires.

2. Look out for fires.
3. Be care about fires.
.......
Are they all the same in meaning?

4. Make sure you don't build a fire.
5. Make sure you don't make a fire.
6. Make sure you don't.... a fire.
(Are they the same?
Can we use other verbs instead of 'build'?)

Sentences 1, 2, and 4 are fine. The others are incorrect.

You could say 'start' in sentence 6.

Thank you or your help....

#3 should be..
Be careful about fires.
Then, it's OK. Am I right?

Yes, now #3 is correct.

1. Watch out for fires, 2. Look out for fires, and 3. Be careful about fires all have similar meanings. They all convey the idea of being cautious and paying attention to the presence of fires.

4. Make sure you don't build a fire, 5. Make sure you don't make a fire, and 6. Make sure you don't ignite a fire all convey the same idea of ensuring that a fire is not created or started. In these sentences, the verb used is specifically related to creating or starting a fire.

While "build" and "make" are commonly used verbs to express the action of creating a fire, there are other verbs that can be used, depending on the context. For example, "start," "ignite," or "light" can also be used instead of "build" or "make" to convey the same meaning. The choice of verb may depend on the specific action being taken to initiate a fire.