there is a boat on the river中的is可以改为have么

there is a boat on the river中的is可以改为have么 是there is a boat in the river还是there is a boat on the river There is a boat in the river 请问,你觉得There is a b______ on the river.bridge 还是boat 合适? "There is hardly any boat on the river"为什么boat用单数 there is a small boat ______________the river Is there a river on the farm Is there a river on the farm? look!There is a boat on the ( r------ ) 1.The sun shuining（ ) the sky 2.There is a boat（ )the river There is a ship on the river中的on可不可以用 in代替 There are teo ducks and a boat on the river.