1st Conditional
tree / a / you / storm / you're / in / stand / if / a / shouldn't / under
If you're in a storm, you shouldn't stand under a tree.
Complete the sentence with should/n't : If there's a fire in a building .... (use a lift)
If there's a fire in a building, you shouldn't use a lift.
Turn this sentence into a question: You shouldn’t go swimming if you see a red flag at the beach.
Should you go swimming if you see a red flag at the beach?