Common mistakes 3

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Notes
1. Put the city before the country and separate them with a comma.
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2 + 3. "Other" and "another" are adjectives in these sentences. We use "other" before plural nouns, no "s", and "another" before singular nouns. Another = one other
These words can also be used as pronouns. For example:
I'll have another. (Another = another one)
Tell the others. (Others = other people) Here you need "s".

4 + 7. spend time on + noun
For example:
How much time did you spend on your homework?
I spent five hours on this essay!
But spend time + ...ing (no "on")
For example: 
I spend my free time reading and watching TV.
You spend too much time playing computer games!

8. The singular and plural forms are the same: one series, two series.