You have one louse and many lice (if this is true, get one of those combs with tiny teeth that are really close together – lice are unpleasant), one mouse and many mice. However, it’s one house and many houses, one spouse and many spouses and one grouse but many grouses.
I feel for those who learn English as a second language because these quirks would be hard to remember.
I am an Eglish as second language speaker, and after 27 years I am still having trouble with lose, loss, loose, lost. I also refer feet as singular and feets as plural.
Gloria: I sympathize with you, because even native English speakers confuse lose and loose. Practice makes perfect :)