1. Q: What is this?
A: It’s a lock. / It’s a padlock.
2. Q: What is it used for?
A: It’s used for locking things up.
or
A: It’s used for keeping things safe and secure.
3. Q: Is it locked or unlocked?
A: It’s unlocked. (Look at the picture.)
4. Q: How do you unlock it?
A: You use a key to unlock it.
or
A: You unlock it by using a key.
5. Q: What can you do if you lose the key?
A: You can find a spare key.
or
A: You might have to break open the lock.
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