The plants _______(die),if you didn't water them

The plants【would die】,if you didn't water them
句子时态保持一致都使用过去时,主句时用过去将来时.
无疑后请采纳.
书山有路勤为径,学海无涯苦作舟.
-----------与君共勉-----------确定是正确答案吗？ 那我再问一个小题…… All the pencils____(use)up确定正确All the pencils【were used】up所有的铅笔都被用光了用被动语态。