If we send the ant so it goes close to, but not on top of, the sand grain, it has little trouble continuing to walk in a straight line.
1	If	if	SCONJ	IN	_	3	mark	3:mark	Discourse=contingency-condition:159->161:0
2	we	we	PRON	PRP	Case=Nom|Number=Plur|Person=1|PronType=Prs	3	nsubj	3:nsubj	Entity=(53-person-giv:act-cf1*-1-ana)
3	send	send	VERB	VBP	Mood=Ind|Number=Plur|Person=1|Tense=Pres|VerbForm=Fin	23	advcl	23:advcl:if	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	5:det	Entity=(183-animal-giv:act-cf2-2-coref
5	ant	ant	NOUN	NN	Number=Sing	3	obj	3:obj	Entity=183)
6	so	so	SCONJ	IN	_	8	mark	8:mark	Discourse=mode-manner:160->159:0
7	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	8	nsubj	8:nsubj|9:nsubj:xsubj|15:nsubj:xsubj	Entity=(183-animal-giv:act-cf2-1-ana)
8	goes	go	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	advcl	3:advcl:so	_
9	close	close	ADV	RB	Degree=Pos	8	xcomp	8:xcomp	_
10	to	to	ADP	IN	_	20	case	20:case	SpaceAfter=No
11	,	,	PUNCT	,	_	10	punct	10:punct	_
12	but	but	CCONJ	CC	_	15	cc	15:cc	_
13	not	not	PART	RB	Polarity=Neg	15	advmod	15:advmod	_
14	on	on	ADP	IN	_	15	case	15:case	_
15	top	top	NOUN	NN	Number=Sing	9	conj	8:xcomp|9:conj:but	_
16	of	of	ADP	IN	_	15	obl	15:obl	SpaceAfter=No
17	,	,	PUNCT	,	_	15	punct	15:punct	_
18	the	the	DET	DT	Definite=Def|PronType=Art	20	det	20:det	Entity=(192-object-giv:act-cf3-3-coref
19	sand	sand	NOUN	NN	Number=Sing	20	compound	20:compound	Entity=(193-substance-giv:inact-cf5-1-coref)
20	grain	grain	NOUN	NN	Number=Sing	9	obl	9:obl:to	Entity=192)|SpaceAfter=No
21	,	,	PUNCT	,	_	3	punct	3:punct	_
22	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	23	nsubj	23:nsubj	Discourse=joint-other_m:161->156:1|Entity=(183-animal-giv:act-cf2-1-ana)
23	has	have	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	0:root	_
24	little	little	ADJ	JJ	Degree=Pos	25	amod	25:amod	_
25	trouble	trouble	NOUN	NN	Number=Sing	23	obj	23:obj	_
26	continuing	continue	VERB	VBG	VerbForm=Ger	23	advcl	23:advcl	_
27	to	to	PART	TO	_	28	mark	28:mark	_
28	walk	walk	VERB	VB	VerbForm=Inf	26	xcomp	26:xcomp	_
29	in	in	ADP	IN	_	32	case	32:case	_
30	a	a	DET	DT	Definite=Ind|PronType=Art	32	det	32:det	Entity=(189-abstract-giv:inact-cf4-3-coref
31	straight	straight	ADJ	JJ	Degree=Pos	32	amod	32:amod	_
32	line	line	NOUN	NN	Number=Sing	28	obl	28:obl:in	Entity=189)|SpaceAfter=No
33	.	.	PUNCT	.	_	23	punct	23:punct	_
