what lesson do they have lesson 要加s么什么时候加,什么时候不加

What time do they have Maths lesson?怎么回答 what lesson do they have lesson 要加s么什么时候加,什么时候不加 What---- they------- （do） now?They------（have）an English lesson. What are they doing?用（a lesson) 回答What are they doing?用（a lesson)该怎么 回答What must they do?用（a meal)回答What must they do?用（a holiday)回答 what do they do? what do they do they They shall do what they what do they What do they what do they What do they need? what animals do they they/have/what/do/(?) what do they what do they do?(工程师) what()they()they()there?what()they()they()there?[do] What time do you have the first lesson What do you think of your English lesson?