Sonnet 14 that Shakespeare's early comedy included a line stating "From women's eyes this doctrine I derive." In the context of Sonnet 14 it is explaining the important of procreation, and that it is necessary. Ovid's "Amores" has a similar line "at mihe te comitem auroras usque futuram- per me perque oculos, siders rostra, tuos." Both Samuel Johnson and George Steevens noted the similar meaning and that it indicates Roman influence on Shakespeare's poetry. Lines 10-11 are saying that one can see that truth and beauty would thrive together; if only you would focus on the business of making provisions for yourself.
Sonnet 99 appears as one syllable (in lines 7, 10, and 15). Line 13's "eate" equals modern past tense "ate". As to its fifteen lines, sonnet structure has never been absolutely fixed, and Sidney Lee adduces many examples of fifteen line sonnets. An extra line is particularly common in linked sonnets, and this sonnet is linked to 98; Malone ended 98 with a colon to demonstrate the connection. However, other scholars have remarked on the clumsiness of the first line and suggested that the quarto text represents an unrevised draft that found its way into print. Edward Massey and others asserted that