Some of the grain appears to be contaminated.
Why the subject is "some" and not "Grain"?
Pierre puts a lot of garlic in his food.
The subject here is "Pierre," but what is the indirect and direct object? Is "Puts a lot of garlic" the indirect object? And "food" a direct object?
I am very confused about subjects, direct objects, and indirect objects. Sometimes just "man" by itself is a subject. Sometimes "a man" is.