1Coupled with this fact is the warning that soon we will no
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1、be coupled with“与……相伴而生,与……结合”本题是倒装了.因为主语the warning that soon we will no longer have workforce to fill the many jobs太长,如果放前面会显得头重脚轻.

2、不定式一般表示目的、或者将来,但是没见过表示结果的.如果你用不定式,意思就是“她从自行车上摔下来的目的就是把腿弄伤.”很别扭吧?