There's often an ice-cream man sell ice-creams outside our school.With his camera,he kept taking pictures of which he did and saw.这两句话错在哪?

There's often an ice-cream man sell ice-creams outside our school.With his camera,he kept taking pictures of which he did and saw.这两句话错在哪?
There's often an ice-cream man sell ice-creams outside our school.
With his camera,he kept taking pictures of which he did and saw.
这两句话错在哪?

There's often an ice-cream man sell ice-creams outside our school.With his camera,he kept taking pictures of which he did and saw.这两句话错在哪?
1.sell改为selling,There's often an ice-cream man selling ice-creams outside our school.
2.which改为what,With his camera,he kept taking pictures of what he did and saw.