How do we use 'a' and 'the'? What is the difference and when do we not use them?
When and how do we use the present perfect and the past perfect?
How do we use modal verbs in conditional structures?
What is the difference between countable and uncountable nouns? How do we recognize them?
When and how do we use prepositions after verbs? For example, what are the differences between 'look for', 'look after', 'look forward to', 'look up' etc?
What are the different names for transportation here? What is the difference between BART, MUNI, shuttle, train, subway, etc? Are they the same or different?
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