1

It was said on this question in a comment that

조사 "하고(and)" cannot occur together with to 을/를. So if you want to use "하고(and)", it must be "이것하고 저것을 해"

Summarized from a book I have from 연세 University in Seoul, there are 4 ways to use ~고 as a conjunctive ending:

  1. Two or more sentences are simply listed.
  2. Two events take place concurrently.
  3. Two events are in a temporal relationship. THe first event precedes the second.
  4. Depending upon the verbs used, the first action still continues while the second takes place.

Examples:

  1. 새가 울고 꽃이 핍니다 Birds sing (cry), and flowers bloom
  2. 나는 피아노를 치고 동생은 노래를 불렀습니다 I was playing the piano while my sister sang
  3. 손을 씻고 저녁 식사를 합니다 (We) wash our hands and eat supper
  4. 형이 새 옷을 입고 외출했습니다 My brother went out wearing new clothes

From what I'm seeing here, ~고 is a conjunctive ending that fully separates two verbs. How can two verbs separated by ~고 not then also themselves each have their own object to modify with or without 을/를?

2

I think you might have misunderstood my comment. (Well, that's the problem with comments: it's too short and I can't go back to edit it.)

하고 can mean at least three different things:

  1. The verb "하다" (do), with the suffix "-고" (... and).

    산책을 하고 집에 들어왔다.

  2. 조사(particle?) "하고", with the same meaning as 와/과 (and).

    하고 미역국을 먹었다.

  3. Used to quote someone. (I think it's also 조사, but for some reason I can't find it in Naver dictionary.)

    선생님께서 "빨리 가자." 하고 말씀하셨다.

In my comment, I'm talking about (2): 조사 "하고" cannot be used together with 은/는/이/가/을/를, even when it is attached to subjects or objects:

철수하고 영희가 도착했다. (O)

철수가하고 영희가 도착했다. (X)

선물하고 카드를 받았다. (O)

선물을하고 카드를 받았다. (X)

Therefore, if you see "-을/를 하고", then it can be only case (1), where "하고" is the verb "하다" + ending "-고". Here are a few examples where they contrast:

[밥하고 미역국]을 먹었다. I ate rice and seaweed soup.

[밥(을) 하고] [전화를 걸었다]. I cooked rice, and made a call.

[숙제하고 가방을] 차에 실었다. I put my homework and backpack in the car.

[숙제(를) 하고] [가방을 차에 실었다.] I did my homework, and put my backpack in the car.

As you can see, "숙제하고 가방을 차에 실었다" can be ambiguous.

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