if引導(dǎo)的條件狀語從句不是主將從現(xiàn)?
下面句子是if 引導(dǎo)的條件狀語從句,句子內(nèi)容很長可以不用看,我想問的是,if 引導(dǎo)的條件狀語從句,主句應(yīng)該用將來時(shí),從句用一般現(xiàn)在時(shí)（主將從現(xiàn)）,但是這里的主句和從句為什么都是各種各樣的時(shí)態(tài)?if引導(dǎo)的條件狀語從句時(shí)態(tài)到底應(yīng)該遵循什么規(guī)律?
1.If it is not a question of resting the body,then perhaps it is the brain that needs resting（如果睡眠的功能不是在于使身體得到休息,那么也許是讓大腦得以休息）【主句一般現(xiàn)在,從句一般現(xiàn)在】
2.If one group of people were disturbed from their eye-movement sleep for several nights on end,and another group were disturbed for an equal period of time but when they were no exhibiting eye-movements,（從句）
the first group began to show some personality disorders while the others seemed more or less unaffected.（主句）【主句從句都是過去時(shí)】
3.You may pick them up in utter exhaustion,if wind over the sea has driven them to a long journey【從句完成時(shí)】（如果海風(fēng)驅(qū)使他們飛行很長距離,你可撿到一些因精疲力盡而掉下來的鷓鴣）
4.If one is obsessed with the success he has acheived,he would lose the chance to purse new sucess.【主句過去將來時(shí),從句一般現(xiàn)在時(shí)】