Thanks and apostrophes

thanks  pl. n.  1.  Grateful feelings; gratitude: a heart full of thanks for our escape. 2. An expression of gratitude: gave thanks to god; a note of thanks to a contributor.  Interjection. 1. Used to express thanks.
 

Thanks!

Thanks a lot!

Thanks a million!

Thanks a bunch!

a.pos.tro.phe   n. 1 The superscript sign (') used to indicate the omission of a letter or letters from a word, the possessive case, and the plurals of numbers, letters, and abbreviations.
 

Rock 'n' roll (rock and roll)

Wouldn't  (would not - contraction)

She's  (she is or she has - contractions)

'Cause (because)

Robson's posts are very interesting. (possessive)

R's and 4's are used informally to substitute for "are" and "for", respectively. (plural of letters and numbers)

See you later.