I am having a lunch. Tell me the diffences.1)I had a lunch. ----explain2)I am having a lunch.----explain3)I have a lunch.----explain4)Having a lunch----explain

I am having a lunch. Tell me the diffences.1)I had a lunch. ----explain2)I am having a lunch.----explain3)I have a lunch.----explain4)Having a lunch----explain what are you doing? I am (只是)having lunch. i am having a hard have lunch ,has lunch ,having lunch ,to have luhave lunch ,has lunch ,having lunch ,to have lunchsam is_at home.i am hungry,i want_.they usually_at one o‘clock.lily always_before 12:30. “我正在吃饭”用英语怎么说?是 I am having lunch 如果不是 I am having lunch ,这种说法错在哪啊? I am having a party for “I am having a wonderful time here. ) 4.I____have lunch at 12:30.But ____ it’s 12:00,I am having my lunch.选项：A usually; often B often; usually C sometimes; often D usually; now为什么？选D I have lunch .还是 I having lunch.哪个对 I am having a class.I will call you back. i am having a surprise party for lana on Friday night中为什么是am having? I'm having lunch.( 对havinglunch提问) 有5处错误,请找出并改正.It's twelve clock now.I am having the lunch at school.I like dumplings,noodle,chicken,hamburger,a hot dog and a milk,My favourite food is chicken. have lunch ,has lunch ,having lunch ,to have luhave lunch ,has lunch ,having lunch ,to have lunchsam is_at home.i am hungry,i want_.they usually_at one o‘clock.lily always_before 12:30.watch tv,waching tv,watches tv ,to watch tvhe is_now.do you wan I am having a birthday party ( ) ( ) you come? I am having a science lessson (对画线部分提问 i,having,am,picnic,with,a ,friends,my(.) Excuse,I am having a baby here!翻译.