Thank you so much for your help.

1. On Saturdays, he goes around the city and takes pictures with his camera.
2. On Saturdays, he goes around the city and takes some pictures with his camera.
[Does #1 mean #2? Or are both different? In #1 is 'pictures' in generic use?]

3. His hobby is taking pictures with a camera.
4. He likes taking pictures with a camera.
[What about 'pictures' in #3 and #4? Is 'pictures' in generic use? Or does 'pictures' mean 'some pictures'?]]

5. He likes taking a picture of the city with a camera.
6. He likes taking one picture of the city with a camera.
[Does #5 mean #6? Or is 'a picture' in generic use?]

1 and 2 mean the same, yes.

In 3 and 4, “pictures” are generic (no specifically named pictures), and yes, you can put “some” in front if you wish.

5 and 6 are just about the same.

In the given sentences, the usage of "pictures" can vary depending on the context. Here's an explanation for each sentence:

1. In sentence #1, "pictures" is used in a generic sense, meaning that on Saturdays he takes multiple pictures around the city. This sentence suggests that he regularly engages in this activity of taking pictures during his city trips.

2. Sentence #2 is similar to the first one, but the addition of the word "some" implies that he takes a few pictures in a more limited manner. It suggests that he takes pictures, but the quantity or frequency might not be as high as in the first sentence.

3. In sentence #3, "pictures" is used in a generic sense. It implies that his overall hobby is taking pictures with a camera. This sentence indicates that photography is his chosen hobby, without specifying the quantity of pictures he takes.

4. Sentence #4 is similar to the previous one. Here, "pictures" is also used generically to convey that he enjoys taking pictures, without providing an exact number or frequency.

5. In sentence #5, "a picture" is used to indicate that he enjoys taking an individual photo of the city. This implies that his focus is on capturing one particular image that represents the city.

6. Sentence #6 is similar to the previous one. By using "one picture," it suggests that he specifically takes only a single picture of the city. This sentence implies that he wants to capture the essence of the city in a solitary photograph.

Both #5 and #6 convey a similar idea in terms of taking a picture of the city, but #5 implies multiple instances of this activity, while #6 specifically refers to just one instance.