You really couldn't have asked for a better start from the Chicago Bears on Sunday night as they took on the Green Bay Packers at Lambeau Field. But you certainly could have asked for a better ending.

The Bears were able to march down the field on their opening offensive possession and capped off the 10-play, 86-yard drive with a rushing touchdown from quarterback Mitchell Trubisky With a 7-0 lead, Chicago's defense took over led by recently acquired edge rusher Khalil Mack who had a strip sack, fumble recovery and interception return for a touchdown on the game.

Everything was clicking early for the Bears as they jumped out to a 17-0 lead. But what was hidden behind that lead beginning in the second quarter was the lackluster play from the offense. The Bears scored just one touchdown on offense and had several promising drives stall or simply result in field goals when they needed to find the end zone.

Head coach Matt Nagy's playcalling was excellent through the first quarter where Trubisky was 8-of-9 for 99 yards, and the Bears appeared to be in a rhythm.

After that, it got ugly and was clear the Bears didn't make the right adjustments to counter what Green Bay was doing. Packers' defensive coordinator Mike Pettine changed things up and went into zone coverage after falling behind while using a lot of nickel and dime looks. Pettine threw five defensive backs on the field to counter the Bears weapons and it worked.

The end result was just six total points in the second half on just 159 yards of offense including some questionable decisions made by Nagy. Following the game, Trubisky laid it all out there and admitted that this offense has a lot of work to do.

“We were running the ball well. The run was opening up the pass and we were in attack mode," Trubisky said. "When you pick up a few completions – and we were just running the ball and picking up first downs – and don’t fall into too many third downs to allow them to get into their pressure package. The more you can do that, the more success you can have. And then when we finish down in the red zone, that’s when we’ll get to where we want to be, which is an elite offense. Until then, we have a lot of work to do and we’ve just got to continue to convert and find ways to finish in the red zone.”

For what is supposed to be a fun, exciting offense in Chicago, it looked lackluster and at times lost. The timing wasn't there for Trubisky and his receivers, the quarterback often decided to tuck and run rather than keep his head up and there was also questionable playcalling.

The Bears offense disappeared in the second half, putting together just two scoring drives that resulted in field goals. With the chance to put their foot on the Packers' throats, Chicago could cash in on those scoring opportunities and it came back to bite them.

One of the plays that might come back to bite this offense is the 3rd and two late in the game with the Bears up three driving in Green Bay territory. After a Packers timeout, the Bears came out in a shotgun formation without Jordan Howard behind Trubisky. They tried to free up Tarik Cohen on a wheel route to the end zone but it never worked out.

Instead, the pass fell incomplete and the Bears settled for three.

Not converting on third downs became a troubling theme for the Bears late in the game and Trubisky even noted that there were some 'risky' calls from this offense.

“We expected a lot of man on third-and-short and they came out and played a bunch of zone. Credit to them for just mixing it up," Trubisky said. "A lot of our calls were built for man. We had some risky calls that we just went with and we blew them and they just made plays that we didn’t. Just have to go back to the film, continue to learn and, like I said, it’s tough when we don’t have on-scout looks. We don’t know what they’re going to bring and you’ve just got to trust the play and hopefully, our execution beats theirs. But, credit to them for coming up with those stops and we’ve just got to do better because those are big plays.”

In a key year of development, Trubisky didn't look like a quarterback that is ready for the big stage yet. The good news for him is that there are 15 more games left this season to show some progress.

"We’ve just got to continue to pull together, which we will," Trubisky said. "We’re headed in the right direction. We’re close, but I don’t know if there’s really any statement.”