"It has been suggested that the company invest in new machinery".
"It is essential that every child have educational opportunities".
If I want to write something like the above sentences, how could I know that now I have to write my verbs in the subjunctive mood ? Why we use the subjunctive mood in AmE?
If someone also shows how to make thses sentences rewritten using "Should" as it is used in BrE that will be great.
Thank you.