It's ___to swim in the river with my friends in the hot day

It's hot in the river.(翻译) 高一英语改错1：It is a great fun to swim in the river on a hot day. We went to swim in the river in a very hot day.这句错在哪儿? 1.( )swim in the river.It's dangerous.(填空) Don't swim in the river a( ) .It's dangerous It's hot in the river否定形式是什么 I went b___ with my friends in the river let's (swim) in the river It’s always hot in summer,the sun _____every day. He swims in the river every day .swim后面为什么加s It's d__ for the children to swim alone in the river.They bo It's d___ for the children to swim alone in the river.