suminha
However, “I think apple is healthy, but banana also can be healthy too” is ok because “but” and “also” is not together.
I think that this sentence is actually not ok.
You should use BUT to join the statements whose meanings are CONTRASTING:
- Positive statement
but negative statement
- Negative statement
but positive statement
You should use AND to join the statements whose meanings are SIMILAR:
- Positive statement
and positive statement
- Negative statement
and negative statement
To understand what I mean please first try this
problem. Below is a spoiler:
C. executives rejected expensive dramas,
but instead sought low-budget independent films.
D. executives rejected expensive dramas
and instead sought low-budget independent films.
You can see that the two statements have similar meanings, not contrasting. In other words, when executives rejected expensive dramas and sought low-budget films, they acted similarly – they avoided expensive pictures in both cases. Therefore, NO contrast is needed and “but” is incorrect. C can be eliminated for this reason.
Now try this
problem. Below is a spoiler:
C. composer who receives popular acclaim while living,
but whose reputation declines after death and never regains its former status
D. composer who receives popular acclaim while living, who declines in reputation after death and who never regained popularity again
Can you see the contrasting statements? A composer becomes popular while living BUT loses popularity after death. Because D fails to deliver this contrast, it is incorrect. Now take your sentence:
- I think apple is healthy, but banana also can be healthy too.
These two statements that “apple is healthy” and that “banana can also be healthy” are NOT contrasting. You need “and” rather than “but” here. Moreover, you need either “also” or “too”, but not both.
You could possibly write “generally, apple is healthy but also can be harmful when eaten not ripe”. You had better reread carefully the links I sent you in my previous post. In the second
link, Ron Purewal gives an example with “but also” alone:
- The drug kills the bacteria
but also kills white cells.
“kills the bacteria” is a good thing, whereas “kills white cells” is a bad thing. So, “but” is ok. Also note that you don't have to treat “but” and “but also” differently. They are more or less the same thing.
You can check whether you understand correctly what is contrasting and what is similar by trying this
problem. Then read Ron
here.