Scan the lines provided from Sonnet 73. Mark the syllables, separate the feet with short vertical lines, and indicate the rhyme scheme.
That time of year thou mayst in me behold ____
When yellow leaves, or non, or few, do hang ___
Upon those boughs which shake against the cold, ____
Bare ruined, choirs where late the sweet birds sang _____
It's confusing, yes, to mark up a passage of verse with all the signs and symbols. I will scan the first few lines for you and give the rhyme scheme of these line, and then you can finish it! Once you understand the task/tools, I think you will find it easier. and when you have seen my scansion of the text, if you want further explanation, follow the link below to "iambic pentameter" and scroll down to the "simple example" given there.
The fact that the verse is written in iambic pentameter is the key. The poetic rhythm of this is based upon our heartbeat and, in stress goes something like this: da DUM, da DUM, da DUM, da DUM, etc. The DUM is in all caps and bolded because this is the syallable of each foot that is stressed. There should be five feet, each foot comprised of two syllables (one unstressed and one stressed), in a line of iambic pentameter verse.
Here's the way I would begin to scan the lines of verse you provide:
That time -- of year -- thou mayst-- in me -- be hold
When yel -- low leaves -- or none -- or few -- do hang
Please note that I can't create the symbols easily on my computer so, instead of a vertical line between the feet, I have used a dash, and instead of the forward slash placed above the stressed syllables, I have made the syllable bold. Instead of the little "u" or breve mark, I have italicized the unstressed syllables. You can see, if you consult the imabic pentameter link below, how to create the slash and the breve above your stressed and unstressed syllables. It will also show you how to separarte you feet.
As for rhyme scheme, sonnets follow a particular rule. Begin with the last word of the first line. This will be your A word. Look at the second line. The last world should not rhyme with word A, so call this word B. In line three you have a rhyme with line one, so this is A again, and in line four, B. Like this:
Hope this helps!