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Hello,

I understand the usage of 'so as to', but how to use so as not to? Example: He did not like it, yet he agreed so as not to upset her. (can we use 'so as not to' in this way?)

2) Again, regarding the usage of so: Can we use it like this: He made a mistake, a mistake so grave as to have ended his marriage.

3) again, as well as: They were similar in size as well as (in) strength. (do we have to repeat (in))

4) A doubt on tenses: That'll be the last time you'll ever scream. (is this okay, or '... you ever scream?)

5) Again, on tenses: For that purpose, they always had to be on guard. (is this okay in simple narrative)

Regards,
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1) Can we use 'so as not to' in this way? -- Yes

2) Again, regarding the usage of so: Can we use it like this: He made a mistake, a mistake so grave as to have ended his marriage.-- Yes, but here it is awkward. 'So grave that it ended...'

3) (do we have to repeat (in)-- No)

4) A doubt on tenses: That'll be the last time you'll ever scream. (is this okay, or '... you ever scream?-- Both are OK.)

5) Again, on tenses: For that purpose, they always had to be on guard. (is this okay in simple narrative-- If the rest of the narrative matches, yes.)
Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
Thanks, M. Can #5 be used for both present and past tense?
No, it is not present. Present is 'have to be'.