用适当的连词将两个句子合成一句,使句子通顺
问题描述：
用适当的连词将两个句子合成一句,使句子通顺
1.Tom come back from school.his mother was doing some washing
2.Gina always sings .Gina is doing some cleaning
答
1.Tom come back from school (while) his mother was doing some washing.
2..Gina always sings (while )she is doing some cleaning.