How shall I start? Well, I guess all non-natives were taught rules like these:
"Use the definite article with the names of museums, galleries, pubs, clubs, restaurants and hotels"
OR
"Use the definite article with the names of airports, railway stations, castles, palaces and similar structures if the name is in the form of COMMON NOUN + STRUCTURE. Otherwise (PROPER NOUN + STRUCTURE), don't use the article."
That's why we have
The White House but
(no article) Buckingham Palace.
But, to be honest, I've never really liked that sort of "rules". In my opininon, they have too many exceptions and cause confusion.
In the text below, NAT means a rule taken from a book written by a native speaker, NON-NAT means just the opposite - a book written by a non-native.
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1) What about the names of bridges? I've seen two rules that contradict one another:
a) (NAT) Always use "the" with the names of bridges.
b) (NON-NAT) Follow this pattern:
COMMON NOUN + BRIDGE = THE
(PROPER NOUN - NAME OF A PERSON) + BRIDGE = NO ARTICLE
NAME OF A PERSON + BRIDGE = THE
Is any of those two correct? All English names of bridges I've seen so far had the definite article except for Tower Bridge. Some examples:
0 Tower Bridge,
The Severn Bridge,
The Clifton Suspension Bridge,
The Golden Gate Bridge,
The Sydney Harbour Bridge.
Well,
Tower,
Severn,
Clifton and
Sydney Harbour are all proper names. Not sure about
Golden Gate. It seems that rule a) is more likely to be correct. Rule b) starts and ends with Tower Bridge

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2) What about the names of lakes? Again, I've seen two rules:
a) (NAT) Never use "the" with the names of single lakes.
b) (NON-NAT) LAKE + NAME, LOCH + NAME = NO ARTICLE, OTHERWISE = THE.
Well, we have
Lake Baikal,
Loch Ness,
Lake Superior etc. But what about
Baikal without the word "lake"? Is that correct? Something tells me rule a) is more likely to be correct.
(Note: don't forget
The Great Lakes :-) ).
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3) What about the names of waterfalls? Surprise: I've seen only one rule (NON-NAT): Never use the definite article with the names of waterfalls.
Well, I've seen
The Horsheshoe Falls and
The American Falls in an article about
(no article here) Niagara Falls.
Thank you in advance for your patience!
Another posts about articles will follow :-).