The preposition 以来
We use the preposition 以来 
to express what had happened between a specific event in the past up until the present moment (in other words, referring to a certain continuous time period leading up to the present).
We should state 以来 after words denoting some event or time.
After 以来, we usually say what has been happening since the indicated past event or time.
to express what had happened between a specific event in the past up until the present moment (in other words, referring to a certain continuous time period leading up to the present).
We should state 以来 after words denoting some event or time.
After 以来, we usually say what has been happening since the indicated past event or time.Scheme
event/time
以来
what's happening
Examples
今年年初以来价格已经上涨了10%
Prices have risen by 10% since the beginning of the year
jīnnián niánchū yǐlái jiàgé yǐjīng shàngzhǎng le bǎifēnzhī shí
星期二以来她一直没上班
She hasn't been to work since Tuesday
xīngqí èr yǐlái tā yìzhí méi shàngbān
这次节食开始以来我体重减了十磅
I've lost ten pounds since the diet started
zhè cì jiéshí kāishǐ yǐlái wǒ tǐzhòng jiǎn le shí bàng
We often use 以来 in a pattern with the prepositions 自 , 自从 and 从 to make a sentence more expressive.
We should state the prepositions before words denoting the event or time. The meaning of the pattern remains the same “since…”.
, 自从 and 从 to make a sentence more expressive.
We should state the prepositions before words denoting the event or time. The meaning of the pattern remains the same “since…”.Scheme
自/自从/从
event/time
以来
what's happening
Examples
自我们上次见面以来情况有些变化
Things have changed a bit since we last met
zì wǒmen shàng cì jiànmiàn yǐlái qíngkuàng yǒuxiē biànhuà
自从她离开他以来，他一直很消沉
Since she left him, he has been depressed
zìcóng tā líkāi tā yǐlái, tā yìzhí hěn xiāochén
从早上8点以来投票很踊跃
Voting has been very active since 8 AM
cóng zǎoshang bā diǎn yǐlái tóupiào hěn yǒngyuè