The adverb 以往 "in the past"
以往 
is used to talk about a situation that happened in the past.
It can only be placed before a subject.
is used to talk about a situation that happened in the past.
It can only be placed before a subject. Pay attention
以往 is usually used in written speech.
Scheme
以往
subject
predicate
Examples
以往他都是七点半就到办公室，今天怎么了？
He used to be at the office at 7:30. What happened today?
yǐwǎng tā dōu shì qī diǎn bàn jiù dào bàngōngshì, jīntiān zěnme le
以往我也曾在一些重大问题上改变自己的观点
I have changed my mind on some important issues in the past
yǐwǎng wǒ yě céng zài yìxiē zhòngdà wèntí shàng gǎibiàn zìjǐ de guāndiǎn
以往 can also be an adjective meaning "previous", "past".
In this case, the particle 的 is placed between 以往 and a noun.
is placed between 以往 and a noun.Examples
凭以往的经验看，他们会迟到的
Based on past experience, they’ll be late
píng yǐwǎng de jīngyàn kàn, tāmen huì chídào de
以往的法律案件没有哪一宗可与此案类比
No previous court case can compare to this one
yǐwǎng de fǎlǜ ànjiàn méi yǒu nǎ yì zōng kě yǔ cǐ àn lèibǐ
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