let's have a pinic next Sunday.保持原意—— ——have a picnic next sunday?—— ——have a picnic next sunday?—— —— ——have a picnic next sunday?—— —— ——a picnic next sunday?

let's have a pinic next Sunday.保持原意—— ——have a picnic next sunday?—— ——have a picnic next sunday?—— —— ——have a picnic next sunday?—— —— ——a picnic next sunday?
let's have a pinic next Sunday.保持原意
—— ——have a picnic next sunday?
—— ——have a picnic next sunday?
—— —— ——have a picnic next sunday?
—— —— ——a picnic next sunday?

let's have a pinic next Sunday.保持原意—— ——have a picnic next sunday?—— ——have a picnic next sunday?—— —— ——have a picnic next sunday?—— —— ——a picnic next sunday?
Shall we
Why not
Why don't we
What about having