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in the PONS Dictionary

ob·struct [əb'strʌkt] VB trans

1. obstruct (block):

obstruct
to obstruct sb's airways
to obstruct sb's airways path
to obstruct sb's airways pipe
to obstruct sb's airways progress
to obstruct sb's airways reform
to obstruct sb from doing sth

2. obstruct (interfere with):

3. obstruct SPORTS:

to obstruct sb
Present
Iobstruct
youobstruct
he/she/itobstructs
weobstruct
youobstruct
theyobstruct
Past
Iobstructed
youobstructed
he/she/itobstructed
weobstructed
youobstructed
theyobstructed
Present Perfect
Ihaveobstructed
youhaveobstructed
he/she/ithasobstructed
wehaveobstructed
youhaveobstructed
theyhaveobstructed
Past Perfect
Ihadobstructed
youhadobstructed
he/she/ithadobstructed
wehadobstructed
youhadobstructed
theyhadobstructed