English questions usually have different word order than statements. When you are unsure about how to form a question, it can be helpful to make a statement and then change the word order. You may also need to change some words.
Present tense questions:
Do + subject + verb
You remember. => Do you remember?
He understands. => Does he understand?
You know Paul. => Do you know Paul?
Paul speaks French. => Does Paul speak French?
Paul and his wife smoke. => Do Paul and his wife smoke?
They live in Rome. => Do they live in Rome?
Be + subject + adjective OR noun
Paul is Italian => Is Paul Italian?
Paul and his wife are smart. => Are Paul and his wife smart?
Italian is a hard language to learn. => Is Italian a hard language to learn?
There are languages that are harder to learn. => Are there languages that are harder to learn?
Rome is a city in Italy. => Is Rome a city in Italy?
Wh + do + subject + verb
Paul speaks (how) many languages. => How many languages does Paul speak?
Paul works (where). => Where does Paul work?
He works there (why). => Why does he work there?
Wh + is + subject
Paul is (where). => Where is Paul?
It is (what time). => What time is it?
Paul's birthday is (when). => When is Paul's birthday?
To make past tense questions, just change the verb tense:
Did you remember? Did Paul and his wife smoke? Not Did Paul and his wife smoked?
Where did Paul work? Why did he work there?
Where was Paul? When was Paul's birthday?
Tenses other than present simple and past simple usually have an auxiliary verb which can be moved to form a question:
Present continuous: You are going. => Are you going?
Present perfect: They have gone. => Have they gone?
Future: They will go. => Will they go?