lunch是不可数名词,一般不说have a lunch,只说have lunch
1.过去时态 I had lunch.我吃过午饭了.
2.现在进行时态 I am having lunch.我正在吃午饭.
3.一般现在时态 I have lunch.我吃午饭.
4.现在进行时态 having lunch 正在吃午饭
lunch是不可数名词,一般不说have a lunch,只说have lunch
1.过去时态 I had lunch.我吃过午饭了.
2.现在进行时态 I am having lunch.我正在吃午饭.
3.一般现在时态 I have lunch.我吃午饭.
4.现在进行时态 having lunch 正在吃午饭