The sheer amount of time that people spend fetching water or falling ill
to preventable diseases deters education and the economy.
Children can’t go to school, and parents can’t earn as much income.
Couple that with a lack of sanitation and the problem intensifies.
< Studio Classroom_2021_0928 >

Q1: Yes. Q2: 本來就有的表達方式，也不算少見。看多了/熟悉了就見怪不怪Q3: 要說是句型也可以。Yes--"Combine that with ...", ""Mix that with ..."(動詞後的受詞可以是其他字)(我舉的動詞例子剛好都是接with) books.google.com 可以找到例子比如: " target="_blank" rel="noreferrer noopener nofollow">

Q4: 也行。畢竟一個用法例子必須多到/頻繁到成為"慣用法"之後字典才會收錄為idiom(s)(/有的字典是標phrase(s)或其它標籤)。很多人會把字典/文法書上找不到的"句型"當成特例。無所謂。比如LDOCE有這片語用法，但是例句裡頭沒有你問的句型。