If you study physics or chemistry then you should describe the real world.
1	If	if	SCONJ	IN	_	3	mark	3:mark	Discourse=contingency-condition:35->36:0
2	you	you	PRON	PRP	Case=Nom|Number=Sing|Person=2|PronType=Prs	3	nsubj	3:nsubj	Entity=(31-person-giv:inact-cf1-1-ana)
3	study	study	VERB	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	10	advcl	10:advcl:if	_
4	physics	physics	NOUN	NN	Number=Sing	3	obj	3:obj	Entity=(45-abstract-new-cf3-1-sgl)
5	or	or	CCONJ	CC	_	6	cc	6:cc	_
6	chemistry	chemistry	NOUN	NN	Number=Sing	4	conj	3:obj|4:conj:or	Entity=(46-abstract-new-cf4-1-sgl)
7	then	then	ADV	RB	PronType=Dem	3	advmod	3:advmod	Discourse=elaboration-additional:36->34:0
8	you	you	PRON	PRP	Case=Nom|Number=Sing|Person=2|PronType=Prs	10	nsubj	10:nsubj	Entity=(31-person-giv:act-cf1-1-ana)
9	should	should	AUX	MD	VerbForm=Fin	10	aux	10:aux	_
10	describe	describe	VERB	VB	VerbForm=Inf	0	root	0:root	_
11	the	the	DET	DT	Definite=Def|PronType=Art	13	det	13:det	Entity=(47-abstract-acc:com-cf2-3-coref
12	real	real	ADJ	JJ	Degree=Pos	13	amod	13:amod	_
13	world	world	NOUN	NN	Number=Sing	10	obj	10:obj	Entity=47)|SpaceAfter=No
14	.	.	PUNCT	.	_	10	punct	10:punct	_
