MPs will have their say on the next steps for Brexit later after European leaders indicated they would consider delaying the UK's departure if a deal is not agreed by March 29.
Theresa May has said MPs will get a vote on delaying Brexit if her deal and a no-deal outcome are both rejected.
MPs will vote on amendments to a government motion in the Commons later.
Debates on the Prime Minister's motion and the various amendments up for discussion began at 1pm with the votes being held at 7pm.
The Speaker has tabled five amendments in total.
Labour on alternative Brexit Plan
Jeremy Corbyn has tabled an official amendment to push for his party's proposals for Brexit.
The party's plans would see a "permanent and comprehensive" customs union with the EU and a close alignment with the single market.
It is thought that if this amendment is defeated, Jeremy Corbyn's party will formally back a People's Vote.
Read more: Jeremy Corbyn warned People's Vote shift will have 'catastrophic' electoral consequences for Labour
The Labour leader insisted if Theresa May's Brexit deal won parliamentary approval, then "there must be a confirmatory public vote".
Motion on allowing an extension on Article 50
The former Conservative environment secretary Caroline Spelman and Labour's Jack Dromey have tabled an amendment to allow a bill to be passed that gives the Commons the chance to delay Britain's exit from the EU.
Read more: Theresa May offers MPs Article 50 delay vote
It acts as a surefire way to ensure that Theresa May abides by her promise to give MPs the power to extend Article 50 if they reject the Prime Minister's deal.
Costa amendment on status of EU citizens after Brexit
Tory MP Alberto Costa has filed an amendment to seek a guarantee on the status of EU citizens, taking into consideration their status under a no-deal Brexit.
The MP stepped down from his unpaid role as parliamentary private secretary (PPS) in the Scotland Office on Wednesday after putting forward the motion.
The amendment has cross-party support from Dominic Raab, Jeremy Corbyn, Jacob Rees-Mogg, Dominic Grieve and Iain Duncan Smith.
SNP and Plaid Cymru no-deal amendment
The Scottish and Welsh parties have tabled a motion, lead by Ian Blackford and Liz Saville Roberts, to show that the Commons "is determined not to leave the European Union without a withdrawal agreement and future framework under any circumstances, and regardless of any exit date.".
Amendment to ensure a 'short-limited extension' to Article 50
In another bid to ensure the Prime Minister stays true to her promise to allow MPs to vote to avoid a no-deal, Labour's Yvette Cooper and Conservative's Sir Oliver Letwin have submitted an amendment to ensure an extension to Article 50.
Read more: What are key points of no-deal Brexit Bill?
It says that if Parliament rejects her deal on March 12 and thereafter rejects a no-deal Brexit, she must bring forward a 'short limited extension' to Article 50 on March 14.
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