According to Michael Swan's Practical English Usage, it is possible to use since without perfect tenses in the main clause, especially in sentences about change. The examples given are:

1. You're looking much better since your operation.

2. She doesn't come round to see us so much since her marriage.

3. Since last Sunday I can't stop thinking about you.

4. Things weren't going so well since Father's illness

I'm unable to understand this rule well enough. What about these sentences:

I'm living at my friend's house since last Sunday. (= I lived somewhere else before Sunday but now I live with my friend, which is a change).

Since coming to London, I play a lot of Cricket (I didn't play much Cricket before coming to London but now I play a lot).

I know her since last year (I didn't know her before last year but now I do).

Are these sentences also correct?

According to Michael Swan's Practical English Usage, it is possible to use since without perfect tenses in the main clause, especially in sentences about change. The examples given are:

1. You're looking much better since your operation.

2. She doesn't come round to see us so much since her marriage.

3. Since last Sunday I can't stop thinking about you.

4. Things weren't going so well since Father's illness.

I'm unable to understand this rule well enough. What about these sentences:

• I'm living at my friend's house since last Sunday. (= I lived somewhere else before Sunday but now I live with my friend, which is a change).

• Since coming to London, I play a lot of Cricket (I didn't play much Cricket before coming to London but now I play a lot).

• I know her since last year (I didn't know her before last year but now I do).*

Are these sentences also correct?

According to Michael Swan's Practical English Usage, it is possible to use since without perfect tenses in the main clause, especially in sentences about change. The examples given are:

1. You're looking much better since your operation.  2. She doesn't come round to see us so much since her marriage.  3. Since last Sunday I can't stop thinking about you.  4. Things weren't going so well since Father's illness

I'm unable to understand this rule well enough. What about these sentences:

I'm living at my friend's house since last Sunday. (= I lived somewhere else before Sunday but now I live with my friend, which is a change).

Since coming to London, I play a lot of Cricket (I didn't play much Cricket before coming to London but now I play a lot).

I know her since last year (I didn't know her before last year but now I do).

Are these sentences also correct?

According to Michael Swan's Practical English Usage, it is possible to use since without perfect tenses in the main clause, especially in sentences about change. The examples given are:

1. You're looking much better since your operation. 

2. She doesn't come round to see us so much since her marriage. 

3. Since last Sunday I can't stop thinking about you. 

4. Things weren't going so well since Father's illness

I'm unable to understand this rule well enough. What about these sentences:

I'm living at my friend's house since last Sunday. (= I lived somewhere else before Sunday but now I live with my friend, which is a change).

Since coming to London, I play a lot of Cricket (I didn't play much Cricket before coming to London but now I play a lot).

I know her since last year (I didn't know her before last year but now I do).

Are these sentences also correct?