We' ll have hour picnic in the people's park.You know where that is.这句中的that为什么不改为is?

we'll have a ( ) tomorrow. We' ll have hour picnic in the people's park.You know where that is.这句中的that为什么不改为is? We'll have great fun_(learn)English We'll have a wonderful time?= have in sun the fun we'll We'll have fun at that we'll have a wonderful time?= we'll have a soccer g____this afternoon. we'll have a winter holiday是什么意思 () Saturday we'll have a show we'll have a s________contest next week 请教We'll have some of that. If it doesn't rain tomorrow,we'll have a picnic______it_____tomorrow,we'll have a picnic We often have basketball ____ an hour after school. We often have basketball gamesan hour after school. We still have half an hour to go anyway We have an hour for lunch等于什么 We have sports for two _______ (hour) every day.