Is "yard work" equal to "gardening"? You may have a yard, but it may not have a garden in there.
34) W: Hello, Thomas
M:Hi, Janis. Are you doing some yard work?
I do not enjoy "yard work" - mowing the lawn, picking up the sticks that have fallen, spreading fertilizer or weed control. On the other hand, I like working with the flowers that are in the flower bed - that part is gardening.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
In BE, 'yard work' is simply 'gardening'.
Please be aware that I'm neither a native English speaker nor a teacher.