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: 本来就有的表达方式，也不算少见。看多了/熟悉了就见怪不怪Q3: 要说是句型也可以。Yes--"Combine that with ...", ""Mix that with ..."(动词后的受词可以是其他字)(我举的动词例子刚好都是接with) books.google.com 可以找到例子比如: https://imgur.com/e7kX5TiQ4: 也行。毕竟一个用法例子必须多到/频繁到成为"惯用法"之后字典才会收录为idiom(s)(/有的字典是标phrase(s)或其它标签)。很多人会把字典/文法书上找不到的"句型"当成特例。无所谓。比如LDOCE有这词组用法，但是例句里头没有你问的句型。