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英文语法correction

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英文语法correction
The following paragraph is the lab report I need to write about the experiment we did in class two days ago, would you correct my grammar and spelling for me, please?
Caffeine Experiment
The goal of this caffeine experiment is try to find out does caffeine rise our heart rate. This experiment is done by the AP Stat students in period 4. Students were sat in their seats and calms down for a few minutes. Then, thry recorded their one minute pulse. After that, the students randomly selected one cup of soda. This is a double-blind experiment which means the students and the teacher don't know who has the regular pepsi and who has the caffeine free pepsi. Then, the students had one minute and thirtyseconds to drink the soda. After they finish drinking the soda, they recorded the number that's on the bottom of the cup. Then,the students worked silently for ten minutes. Ten minutes later, the students recorded their one minute pulse again. And then, they calculated the change in their heart rate. Later, the teacher told the students who got the regular pepsi and who got the caffeine free pepsi accroding to their cup numbers.
Caffeine Experiment
The goal of this caffeine experiment is to try to find out if/ whether caffeine raise our heart rates.This experiment is done by the AP Stat students in period 4.Students are seated and calm down for a few minutes.Then,try recording their one-minute pulse.After that,the students randomly choose one cup of soda each.This is a double-blind experiment,which means the students and the teacher don't know who has the regular pepsi and who has the caffeine free pepsi.Then,the students have one minute and thirty seconds to drink the soda.After they finish drinking the soda,they record the number that's on the bottom of the cup.Then,the students work silently for ten minutes.Ten minutes later,the students record their one-minute pulse again.And then,they calculate the change in their heart rates.Later,the teacher tells the students who got the regular pepsi and who got the caffeine free pepsi accroding to their cup numbers.
再问: 有时候不是很明白, 明明这个实验是两天前做的, 为什么不用过去式呢? 请你帮我回答一下好么
再答: 如果是一篇叙述文,就用过去时。如果是实验报告,就用一般现在时。
再问: 我的图表的titile 是: The Change In Heart Rate Individuals After the Students Drinkthe Caffeine Free Pepsi for 10 Minutes 这个title好不好
再答: 可以,就是 Individuals 意思不清。你中文标题是什么?
再问: 我的意思就是the change in heart rate不是整个班级的average, 是个人的change in heart rate
再答: The individual change in his/her heart rate...
再问: 你可以把这篇东西改为过去式的么, 然后再发给我,谢谢
再答: Experiment The goal of this caffeine experiment is to try to find out if/ whether caffeine raises our heart rates. This experiment was done by the AP Stat students in period 4. Students were seated and calmed down for a few minutes. Then, they tried recording their one-minute pulse. After that, the students randomly chose one cup of soda each. This was a double-blind experiment, which meant the students and the teacher didn't know who had the regular pepsi and who had the caffeine free pepsi. Then, the students had one minute and thirty seconds to drink the soda. After they finished drinking the soda, they recorded the number on the bottom of the cup. Then,the students worked silently for ten minutes. Ten minutes later, the students recorded their one-minute pulse again. And then, they calculated the change in their heart rates. Later, the teacher told the students who got the regular pepsi and who got the caffeine free pepsi accroding to their cup numbers.