sothat可以放在句首吗？
so that引导的目的状语从句可以放在句首。
so that 引导结果状语从句时，总是放在主句之后。如
He studied hard so that he passed the exam. 他学习用功，所以通过了考试。
Write out this word ten times so that you learn how to spell it. 把这个字抄写十遍，你就能记住它怎么拼写了。
so tha t引导结果状语从句时，其前有时可以使用逗号
▲若so that引导的是目的状语从句，则可位于主句之前。
or so是什么词性？
or so是副词词性。
Your cousin is not so strong or so merry as you are .
你的表弟不像你这么健壮，也不像你这么开心。
No pestilence had ever been so fatal, or so hideous .
以往的瘟疫从没象这次那么恐怖，那么骇人听闻。
He is forty or so .
他大概是四十岁。
There was fifteen years or so difference in age between the two women .
这两个女性的年令相差大约十五岁。
Only in the past century or so have pens provided this feature .
钢笔具备这个特点，还只有一百年左右的历史。
We felt a little constraint with the new teacher for the first day or so .
在开头一两天，我们对新教师感到有点拘束。
A month or so later, nutkin was able to catch sight of the target room .
过了一个月左右，纳特金有机会看到目标房间。
I had butterflies in my stomach for an hour or so before i was due to make my speech .
在轮到我演讲之前，我忐忑不安大约一小时。
She lived in the little village of eaton, ten miles or so out of grantham .
她住在伊顿地区的一个小村庄里，距格兰瑟姆约有十英里。
We arrived at last in delhi, and set out for morbund, a dozen or so miles away .
我们终于到了德里，又从那里到了十多里外的摩奔德。