Please check my sentences grammatically (7.8)

I think you watched look at the stuff that I made sentences on the site. :)  I'm afraid that I'm gonna be burnt out because of too much work. If I was too tired, I couldn't know whether the milk went bad or not. It would upset my stomach. If I have kids, I don't wouldn't allow them to approach close to the/my balcony. When you cook using an oven, you it might burn if you don't watch out. I think there are many accidents because of carelessness. In the bathroom, you have to be careful, so you don't slide there. The floor is usally wet with water, soap and so on. If you slide there, it might break your bones. I haven't got had any accident in the garden. I was scared that the elevator stoped would stop while going to upstairs. I imagined if the elevator fell down.