First, we stumble upon the verb '
shall', which is rarely used in everyday language but is one of the most popular verbs of Legal English. Why do lawyers love 'shall'?
You may remember from your beginner-level English lessons that 'shall' is a modal verb used to express intentions of the speaker (as in '
I shall go the restaurant tomorrow') or someone else's obligations (as in, '
You shall go to school tomorrow'). It appears, however, that the majority of English speakers have never strictly followed these grammatical rules, and in modern everyday English, 'will' is more common in nearly all uses (see the usage guide on 'shall' in Merriam-Webster dictionary
here).
Lawyers, being the most pedantic users of the English language, have decided that the grammatical rule cited above
shall be followed strictly, and they use 'shall' in their writings extensively. So extensively that, in fact, many authorities on legal writing are now recommending to do away with 'shall' entirely (see, for example,
US Government's guidelines on plain language,
The Federal Register Documents Drafting Handbook or this
article by the prominent US legal writing authority Brian A. Garner in the ABA Journal). Others, including another well-known US legal writing expert, Ken Adams,
recommend keeping 'shall' in your contracts but limiting its use to several select situations.