(1) Marry too soon, and you’ll repent too late. 

(2) It is too soon to sow yet.

(3) He aggravated his condition by leaving hospital too soon.

(4) It's too soon to say if he'll survive.

(5) But they have rejoiced too soon.

(6) We arrived not a moment too soon .

(7) It's too soon to give a definite answer.

(8) Don't bathe too soon after eating.

(9) It's too soon to make a judgment about what the outcome will be.

(10) It's too soon yet to look for results.

(11) The holidays were over all too soon .

(12) The end of the trip came all too soon.

(13) Help came not an instant too soon.

(14) We reached the station an hour too soon.

(15) All too soon the party was over.

(16) The plot backfired when the bomb exploded too soon.

(17) The end of the holiday came all too soon.

(18) Help arrived - and not a moment too soon.

(19) Many students prefer not to specialize too soon.

(20) It is too soon to reach any definitive judgement.

(21) All too soon the stilted conversation ran out.

(22) Darkness descended too soon.

(23) The ambulance finally arrived[sentence dictionary], and not a moment too soon.

(24) It's still too soon to say whether the operation was a success.

(25) What is right to be done cannot be done too soon.

(26) I retired late, for as always the morning would arrive too soon.

(27) He won't be home for ages yet ... Oh, I spoke too soon - here he is now!

(28) So far, he seems to be handling the job well, but it's really too soon to judge.

(29) He lamented that people had expected too much of him too soon.

(30) I'd like a friendship that might lead to something deeper, but I wouldn't want to commit myself too soon.