On a eu des difficultés.
1	On	on	PRON	_	Gender=Masc|Number=Sing|Person=3|PronType=Ind	3	nsubj	_	wordform=on
2	a	avoir	AUX	_	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	aux:tense	_	_
3	eu	avoir	VERB	_	Gender=Masc|Number=Sing|Tense=Past|VerbForm=Part	0	root	_	_
4	des	un	DET	_	Definite=Ind|Number=Plur|PronType=Art	5	det	_	_
5	difficultés	difficulté	NOUN	_	Gender=Fem|Number=Plur	3	obj	_	SpaceAfter=No
6	.	.	PUNCT	_	_	3	punct	_	_
