I think that's one I remember, a lot because when I was in 1st grade, I was sick a lot of the year, and I was out of school a lot of the year.
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(ROOT (S (S (NP (PRP I)) (VP (VBP think) (SBAR (IN that) (S (VP (VBZ 's) (NP (NP (CD one)) (SBAR (S (NP (PRP I)) (VP (VP (VBP remember)) (, ,) (NP (NP (DT a) (NN lot)) (UCP (SBAR (IN because) (S (SBAR (WHADVP (WRB when)) (S (NP (PRP I)) (VP (VBD was) (PP (IN in) (NP (JJ 1st) (NN grade)))))) (, ,) (NP (PRP I)) (VP (VBD was) (ADJP (JJ sick))))) (NP (NP (DT a) (NN lot)) (PP (IN of) (NP (DT the) (NN year))))))))))))))) (, ,) (CC and) (S (NP (PRP I)) (VP (VBD was) (ADVP (IN out) (PP (IN of) (NP (NN school)))) (NP (NP (DT a) (NN lot)) (PP (IN of) (NP (DT the) (NN year)))))) (. .)))
I missed virtually all of 1st grade because I was sick on a regular basis during that period. 
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(ROOT (S (NP (PRP I)) (VP (VBD missed) (NP (NP (RB virtually) (DT all)) (PP (IN of) (NP (JJ 1st) (NN grade)))) (SBAR (IN because) (S (NP (PRP I)) (VP (VBD was) (ADJP (JJ sick) (PP (IN on) (NP (DT a) (JJ regular) (NN basis)))) (PP (IN during) (NP (DT that) (NN period))))))) (. .)))