BAD: It is two months now that I left Germany.
GOOD: It is two months now since I left Germany.
a week/two months etc + since something happened (NOT that ): 'It's almost two years since I started my PhD.'
BAD: I was shocked by the sight that I could hardly speak.
GOOD: I was so shocked by the sight that I could hardly speak.
so + adjective/adverb + that clause: 'I'm so tired that I can't keep awake.' 'He spoke so quickly that nobody could understand him.'
BAD: He closed the door quietly that nobody would hear him.
GOOD: He closed the door quietly so that nobody would hear him.
Use so that to express purpose (NOT that ): 'The burglars turned off all the lights so that they wouldn't be seen.'
BAD: Children are not as easy to please nowadays that they were in the past.
GOOD: Children are not as easy to please nowadays as they were in the past.
When making a comparison, use as/so ... as (NOT as/so ... that ): 'It's as hard to get into university today as it was ten years ago.'
BAD: It worried me that the letter had not arrived, especially that it had never happened before.
GOOD: It worried me that the letter had not arrived, especially since/as it had never happened before.
When giving a reason for something, use since or as (NOT that ): 'Instead of cooking, why don't we get a take-away, especially as it's so late.'
BAD: The weather has been very good, except for two days that it rained.
GOOD: The weather has been very good, except for two days when it rained.
When the meaning is 'at/on/in/during which' (referring to time), use when (NOT that ): 'These are the times when Dr Roberts will be able to see you.'
Compare: 'I shall always remember the two days that I spent in Paris.'
BAD: Sitting next to me was an old lady, that seemed to be sound asleep.
GOOD: Sitting next to me was an old lady, who seemed to be sound asleep.
That is used to introduce an identifying relative clause (one which identifies, defines, or restricts the preceding noun): 'The woman that is sitting behind us is Tom's music teacher.' 'The man that I marry will have lots of money.'
That is not used to introduce a non-identifying relative clause (one which simply adds more information about the noun).
BAD: If you haven't sent it yet, I'd be pleased if you would do that as soon as possible.
GOOD: If you haven't sent it yet, I'd be pleased if you would do so as soon as possible.
To make a precise reference to a previously mentioned action, use do so (NOT do that ): 'I asked him politely to take his feet off the seat but he refused to do so.'
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