Question

the water in this river is highly polluted ,so we can't go swimming in it--> because
the weather was cold , so we had to cancel your picnic-->because

nga was careless,so she broke the cup --> since

the bus it late,so Lan is going to be late for school-->since

ba stayed up late watching tv, so he was tired--->since

it ranined very heavily , so we didn't go out for lunch-->since

there was a big storm , so we delayed our trip to london-->as

nga has had a sore leg , so she had diffculty in walking-->as

Answer 1

the water in this river is highly polluted ,so we can't go swimming in it

--> because the water in this river is highly polluted , we can't go swimming in it

the weather was cold , so we had to cancel your picnic

-->because the weather was cold , we had to cancel your picnic

nga was careless,so she broke the cup

--> since nga was careless, she broke the cup

the bus it late,so Lan is going to be late for school

-->since the bus it late, Lan is going to be late for school

ba stayed up late watching tv, so he was tired

--->since ba stayed up late watching tv, he was tired

-->sinceit ranined very heavily , we didn't go out for lunch

there was a big storm , so we delayed our trip to london

-->as there was a big storm , we delayed our trip to london

nga has had a sore leg , so she had diffculty in walking

-->as nga has had a sore leg , she had diffculty in walking