We use "What" for things. It is usually used in interrogative sentenses. We use "Where" for places in interrogative senteses. We use "Who" for livebeings in interrogative sentenses. Now we will practise these words in sentenses.
We use "used to" to express past time habits. After "used to" we place first form of verb in the sentense. Now we will practice these kinds of sentenses.
We use "Should" in English sentenses for giving suggestions or advice. When you or someone else wants to give you suggestions or advice then in that case "should" is used in the sentense. We use first form of verb after "Should".