1 to think (i.e. to take it to be true that ...) (Usually there is an implication that the notion is mistaken – except when expressing one's own current opinion.)

1 because

2 owing to

3 on account of

1 to forget

1 to become

2 to turn into

1 as (in the capacity of)

2 to take sth as

3 to act as

4 to serve as

5 to behave as

6 to become

7 to be

8 to do

9 by (in the passive voice)

1 once is more than enough (idiom)

1 one divides into two

2 to be two-sided

3 there are two sides to everything

4 to see both sb's good points and shortcomings (idiom)

1 lit. teacher for one day, father for ever (idiom)

1 (idiom) it's a deal

2 that's settled then

1 each word carries weight

2 a promise must be kept (idiom)